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Need help on passing custom objects (classes) to web service

Hello,

I'm currently developing a web service that retrieves data from an employee
table. I would like to send and retrieve a custom employee class to/from the
webservice. I have currently coded the custom employee class and have built
it as a separate library (employee.dll). This employee.dll is being
referenced by both the web service and the windows application.

I face the following problem when I send this class to the webservice.

1. The procedures and functions are not getting serialized. i.e. when the
webservice returns this class, I'm unable to access the procedures and
functions for manipulating the data in the class.

Could someone let me know how I could solve this issue? I'm in trouble and
am badly in need of help. Please advise.

Thanks,
Noel

Nov 23 '05 #1
12 5299
The methods are never serialized in web services, only data (state) is. You
could serialize and de-serialize into the same type, but it will require
some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
Hello,

I'm currently developing a web service that retrieves data from an employee table. I would like to send and retrieve a custom employee class to/from the webservice. I have currently coded the custom employee class and have built it as a separate library (employee.dll). This employee.dll is being
referenced by both the web service and the windows application.

I face the following problem when I send this class to the webservice.

1. The procedures and functions are not getting serialized. i.e. when the
webservice returns this class, I'm unable to access the procedures and
functions for manipulating the data in the class.

Could someone let me know how I could solve this issue? I'm in trouble and
am badly in need of help. Please advise.

Thanks,
Noel

Nov 23 '05 #2
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is. You could serialize and de-serialize into the same type, but it will require
some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
Hello,

I'm currently developing a web service that retrieves data from an

employee
table. I would like to send and retrieve a custom employee class to/from

the
webservice. I have currently coded the custom employee class and have

built
it as a separate library (employee.dll). This employee.dll is being
referenced by both the web service and the windows application.

I face the following problem when I send this class to the webservice.

1. The procedures and functions are not getting serialized. i.e. when the webservice returns this class, I'm unable to access the procedures and
functions for manipulating the data in the class.

Could someone let me know how I could solve this issue? I'm in trouble and am badly in need of help. Please advise.

Thanks,
Noel


Nov 23 '05 #3
Could you please post the code snippets? Thanks!

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is.

You
could serialize and de-serialize into the same type, but it will require
some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
Hello,

I'm currently developing a web service that retrieves data from an

employee
table. I would like to send and retrieve a custom employee class
to/from
the
webservice. I have currently coded the custom employee class and have

built
it as a separate library (employee.dll). This employee.dll is being
referenced by both the web service and the windows application.

I face the following problem when I send this class to the webservice.

1. The procedures and functions are not getting serialized. i.e. when

the webservice returns this class, I'm unable to access the procedures and
functions for manipulating the data in the class.

Could someone let me know how I could solve this issue? I'm in trouble and am badly in need of help. Please advise.

Thanks,
Noel



Nov 23 '05 #4
Noel

What about creating serialisable types from schema definitions and then
passing the xml as a XmlNode or XmlDocument and then deserialising and
reserialising inside the web service. That way if anyone else needs to use
your web service, you only need publish the schema and wsdl and anyone could
bind to it.

As for the employee.dll, could you expose the functionality as a web
service? It may make your application a bit chatty on the wire depending on
how you use it, but a least you won't have as many deployment headaches
(albeit reduced with .net).

Apologies if I've misunderstood Manohar's comment, but manual changes to the
web service proxy would be lost if you made a change to the web service and
refreshed the reference at the client end.

HTH

Glenn

"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is.

You
could serialize and de-serialize into the same type, but it will require
some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
Hello,

I'm currently developing a web service that retrieves data from an

employee
table. I would like to send and retrieve a custom employee class
to/from
the
webservice. I have currently coded the custom employee class and have

built
it as a separate library (employee.dll). This employee.dll is being
referenced by both the web service and the windows application.

I face the following problem when I send this class to the webservice.

1. The procedures and functions are not getting serialized. i.e. when

the webservice returns this class, I'm unable to access the procedures and
functions for manipulating the data in the class.

Could someone let me know how I could solve this issue? I'm in trouble and am badly in need of help. Please advise.

Thanks,
Noel



Nov 23 '05 #5
There is so little code, that I thought I'd explain a bit more. Please do
not mistake me, just let me know if you still need the code and I'll send it
across.

This is what I have in the project:

1. Employee project (stand alone executable - windows application)
2. Employee Class Built as a library. This has been compiled as a library
just to allow me to use in both the web services as well as the Employee
Project.
3. Web service that interfaces with the database.

The web service and the employee project reference the employee library.

In the windows application, I create an instance of webservice and pass the
employee object as reference, like:

Dim wsEmp as New EmployeeWebServ ice
Dim obj As EmployeeObject
' obj is sent across by reference - Error occurs here
' (like Employee Object cannot be
' typecast to ' EmployeeWebServ ice.EmployeeObj ect)
wsEmp.GetData(o bj)

In the web service, I create an instance of the employee object and fill it
with data from the webservice, like:

Sub GetData(ByRef obj As EmployeeObject)
obj = New EmployeeObject
' Access database and fill Employee object with data
FillData(obj)
End Sub

I get an error "Invalid Typecast" in wsEmp.GetData(o bj).

Both the objects (Windows and Web Service) are the same and refer to
Common.Employee Object. I'm wondering if I need to mark the
Common.Employee Object as serializable (Not sure though).

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:ee******** ******@TK2MSFTN GP09.phx.gbl...
Could you please post the code snippets? Thanks!

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is.
You
could serialize and de-serialize into the same type, but it will
require some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
> Hello,
>
> I'm currently developing a web service that retrieves data from an
employee
> table. I would like to send and retrieve a custom employee class to/from the
> webservice. I have currently coded the custom employee class and have built
> it as a separate library (employee.dll). This employee.dll is being
> referenced by both the web service and the windows application.
>
> I face the following problem when I send this class to the webservice. >
> 1. The procedures and functions are not getting serialized. i.e. when the
> webservice returns this class, I'm unable to access the procedures
and > functions for manipulating the data in the class.
>
> Could someone let me know how I could solve this issue? I'm in

trouble and
> am badly in need of help. Please advise.
>
> Thanks,
> Noel
>
>
>



Nov 23 '05 #6
Glenn, I like your idea. Could you please point me to some source code or
website where I could learn how to do this? I'll be glad if you could help.

Thanks in advance.

"Glenn" <cs****@blackwi nter.net> wrote in message
news:OW******** ******@tk2msftn gp13.phx.gbl...
Noel

What about creating serialisable types from schema definitions and then
passing the xml as a XmlNode or XmlDocument and then deserialising and
reserialising inside the web service. That way if anyone else needs to use your web service, you only need publish the schema and wsdl and anyone could bind to it.

As for the employee.dll, could you expose the functionality as a web
service? It may make your application a bit chatty on the wire depending on how you use it, but a least you won't have as many deployment headaches
(albeit reduced with .net).

Apologies if I've misunderstood Manohar's comment, but manual changes to the web service proxy would be lost if you made a change to the web service and refreshed the reference at the client end.

HTH

Glenn

"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is.
You
could serialize and de-serialize into the same type, but it will
require some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
> Hello,
>
> I'm currently developing a web service that retrieves data from an
employee
> table. I would like to send and retrieve a custom employee class to/from the
> webservice. I have currently coded the custom employee class and have built
> it as a separate library (employee.dll). This employee.dll is being
> referenced by both the web service and the windows application.
>
> I face the following problem when I send this class to the webservice. >
> 1. The procedures and functions are not getting serialized. i.e. when the
> webservice returns this class, I'm unable to access the procedures
and > functions for manipulating the data in the class.
>
> Could someone let me know how I could solve this issue? I'm in

trouble and
> am badly in need of help. Please advise.
>
> Thanks,
> Noel
>
>
>



Nov 23 '05 #7
Noel

Not a problem, but can't do it this evening, Man City vs Bolton and I've got
a date with the pub, I'll post some more detail tommorrow morning (GMT ).

Cheers

Glenn

"Noel" <no****@nospam. com> wrote in message
news:Ou******** ******@TK2MSFTN GP09.phx.gbl...
Glenn, I like your idea. Could you please point me to some source code or
website where I could learn how to do this? I'll be glad if you could help.
Thanks in advance.

"Glenn" <cs****@blackwi nter.net> wrote in message
news:OW******** ******@tk2msftn gp13.phx.gbl...
Noel

What about creating serialisable types from schema definitions and then
passing the xml as a XmlNode or XmlDocument and then deserialising and
reserialising inside the web service. That way if anyone else needs to use
your web service, you only need publish the schema and wsdl and anyone

could
bind to it.

As for the employee.dll, could you expose the functionality as a web
service? It may make your application a bit chatty on the wire depending on
how you use it, but a least you won't have as many deployment headaches
(albeit reduced with .net).

Apologies if I've misunderstood Manohar's comment, but manual changes to

the
web service proxy would be lost if you made a change to the web service

and
refreshed the reference at the client end.

HTH

Glenn

"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
> The methods are never serialized in web services, only data (state)

is. You
> could serialize and de-serialize into the same type, but it will require > some manual changes to your proxy classes (you need to reference the
> employee assembly, instead of proxy-generated types).
>
> --
> Manohar Kamath
> Editor, .netWire
> www.dotnetwire.com
>
>
> "Noel" <no****@nospam. com> wrote in message
> news:Ol******** *****@tk2msftng p13.phx.gbl...
> > Hello,
> >
> > I'm currently developing a web service that retrieves data from an
> employee
> > table. I would like to send and retrieve a custom employee class

to/from
> the
> > webservice. I have currently coded the custom employee class and have > built
> > it as a separate library (employee.dll). This employee.dll is being > > referenced by both the web service and the windows application.
> >
> > I face the following problem when I send this class to the webservice. > >
> > 1. The procedures and functions are not getting serialized. i.e. when the
> > webservice returns this class, I'm unable to access the procedures and > > functions for manipulating the data in the class.
> >
> > Could someone let me know how I could solve this issue? I'm in trouble and
> > am badly in need of help. Please advise.
> >
> > Thanks,
> > Noel
> >
> >
> >
>
>



Nov 23 '05 #8
Noel,

Here's the problem:

You are sending in obj, which is of different type than the proxy type:

wsEmp.GetData(o bj)

It is expecting: EmployeeWebServ ice.EmployeeObj ect -- this is a proxy type,
whereas your EmployeeObject is in a different namespace.

To remedy this, you need to manually change your proxy class, remove the
type EmployeeWebServ ice.EmployeeObj ect from the class, and add a reference
to your Employee library in the proxy class (using Imports). This tricks the
compiler into thinking that you are using the proxy type, while it is
actually using your custom type.

Hope that helps.

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:O6******** ******@TK2MSFTN GP15.phx.gbl...
There is so little code, that I thought I'd explain a bit more. Please do
not mistake me, just let me know if you still need the code and I'll send it across.

This is what I have in the project:

1. Employee project (stand alone executable - windows application)
2. Employee Class Built as a library. This has been compiled as a library
just to allow me to use in both the web services as well as the Employee
Project.
3. Web service that interfaces with the database.

The web service and the employee project reference the employee library.

In the windows application, I create an instance of webservice and pass the employee object as reference, like:

Dim wsEmp as New EmployeeWebServ ice
Dim obj As EmployeeObject
' obj is sent across by reference - Error occurs here
' (like Employee Object cannot be
' typecast to ' EmployeeWebServ ice.EmployeeObj ect)
wsEmp.GetData(o bj)

In the web service, I create an instance of the employee object and fill it with data from the webservice, like:

Sub GetData(ByRef obj As EmployeeObject)
obj = New EmployeeObject
' Access database and fill Employee object with data
FillData(obj)
End Sub

I get an error "Invalid Typecast" in wsEmp.GetData(o bj).

Both the objects (Windows and Web Service) are the same and refer to
Common.Employee Object. I'm wondering if I need to mark the
Common.Employee Object as serializable (Not sure though).

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:ee******** ******@TK2MSFTN GP09.phx.gbl...
Could you please post the code snippets? Thanks!

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
> The methods are never serialized in web services, only data (state) is. You
> could serialize and de-serialize into the same type, but it will require > some manual changes to your proxy classes (you need to reference the
> employee assembly, instead of proxy-generated types).
>
> --
> Manohar Kamath
> Editor, .netWire
> www.dotnetwire.com
>
>
> "Noel" <no****@nospam. com> wrote in message
> news:Ol******** *****@tk2msftng p13.phx.gbl...
> > Hello,
> >
> > I'm currently developing a web service that retrieves data from an
> employee
> > table. I would like to send and retrieve a custom employee class

to/from
> the
> > webservice. I have currently coded the custom employee class and have > built
> > it as a separate library (employee.dll). This employee.dll is being > > referenced by both the web service and the windows application.
> >
> > I face the following problem when I send this class to the webservice. > >
> > 1. The procedures and functions are not getting serialized. i.e. when the
> > webservice returns this class, I'm unable to access the procedures and > > functions for manipulating the data in the class.
> >
> > Could someone let me know how I could solve this issue? I'm in trouble and
> > am badly in need of help. Please advise.
> >
> > Thanks,
> > Noel
> >
> >
> >
>
>



Nov 23 '05 #9
Yes, you will lose the changes to the proxy classes if you re-generated the
proxy class. However, this is one of those "to-do" if this ever happened.
And also, once you have the web service solidified, the proxy class should
never change -- as a change would mean a change in the version.

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Glenn" <cs****@blackwi nter.net> wrote in message
news:OW******** ******@tk2msftn gp13.phx.gbl...
Noel

What about creating serialisable types from schema definitions and then
passing the xml as a XmlNode or XmlDocument and then deserialising and
reserialising inside the web service. That way if anyone else needs to use your web service, you only need publish the schema and wsdl and anyone could bind to it.

As for the employee.dll, could you expose the functionality as a web
service? It may make your application a bit chatty on the wire depending on how you use it, but a least you won't have as many deployment headaches
(albeit reduced with .net).

Apologies if I've misunderstood Manohar's comment, but manual changes to the web service proxy would be lost if you made a change to the web service and refreshed the reference at the client end.

HTH

Glenn

"Noel" <no****@nospam. com> wrote in message
news:un******** ******@TK2MSFTN GP14.phx.gbl...
Thanks for the reply Manohar.

When I try to reference the employee assembly instead of proxy-generated
types, I get an invalid type-cast error. BTW, I'm trying to pass the
employee object to the web-service as a reference. Is there a way to get
around the invalid type cast error?

Thanks in advance.

"Manohar Kamath" <mk*****@TAKETH ISOUTkamath.com > wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..
The methods are never serialized in web services, only data (state) is.
You
could serialize and de-serialize into the same type, but it will
require some manual changes to your proxy classes (you need to reference the
employee assembly, instead of proxy-generated types).

--
Manohar Kamath
Editor, .netWire
www.dotnetwire.com
"Noel" <no****@nospam. com> wrote in message
news:Ol******** *****@tk2msftng p13.phx.gbl...
> Hello,
>
> I'm currently developing a web service that retrieves data from an
employee
> table. I would like to send and retrieve a custom employee class to/from the
> webservice. I have currently coded the custom employee class and have built
> it as a separate library (employee.dll). This employee.dll is being
> referenced by both the web service and the windows application.
>
> I face the following problem when I send this class to the webservice. >
> 1. The procedures and functions are not getting serialized. i.e. when the
> webservice returns this class, I'm unable to access the procedures
and > functions for manipulating the data in the class.
>
> Could someone let me know how I could solve this issue? I'm in

trouble and
> am badly in need of help. Please advise.
>
> Thanks,
> Noel
>
>
>



Nov 23 '05 #10

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ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main...
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7425
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language...
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7682
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. ...
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7935
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that...
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7449
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For...
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3479
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in...
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3465
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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1037
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
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734
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating...

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