Formatting addresses on web page

Mike

I want to suppress blank lines in an address on a web page.

At the moment, I am displaying the data like this:

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1" )%>'></asp:Label> 
<asp:Label ID="Address2Lab el" runat="server" Text='<%#
Eval("Address2" )%>'></asp:Label> 
<asp:Label ID="Address3Lab el" runat="server" Text='<%# Eval("Address3" )
%>'></asp:Label> 
<asp:Label ID="TownLabel" runat="server" Text='<%#
Eval("Town")%>' ></asp:Label> 
<asp:Label ID="LocationLab el" runat="server" Text='<%# Eval("Location" )
%>'></asp:Label> 
<asp:Label ID="PostcodeLab el" runat="server" Text='<%# Eval("Postcode" )
%>'></asp:Label> 
<asp:Label ID="TelephoneLa bel" runat="server" Text='<%# Eval("Telephone ")
%>'></asp:Label> 
<asp:Label ID="FaxLabel" runat="server" Text='<%#
Eval("Fax")%>'> </asp:Label> 
<asp:Label ID="WebLabel" runat="server" Text='<%#
Eval("Web")%>'> </asp:Label> 

This of course creates blank lines on the page if a line is empty.

I created a method that checks to see if there was anything in the field and
then builds a string including the field, or excluding it depending on the
result:

public static string FormatAddress(s tring ad1, string ad2, string ad3,
string town, string county, string post)
{
string FormattedAddres s ="";
if (ad1 != "")
{ FormattedAddres s = ad1 + " "; }
if (ad2 != "")
{ FormattedAddres s += ad2 + " "; }
if (ad3 != "")
{ FormattedAddres s += ad3 + " "; }
if (town != "")
{ FormattedAddres s += town + " "; }
if (county != "")
{ FormattedAddres s += county + " "; }
if (post != "")
{ FormattedAddres s += post + " "; }
return FormattedAddres s;
}

Then I tried to pass this into it:

<asp:Label ID="FormatAddre ssLabel" runat="server" Text='<%#
MyUtilityClass. FormatAddress(( string)Eval("Ad dress1"),
(string)Eval("A ddress2"), (string)Eval("A ddress3")...%>' ></asp:Label>

but it fell over with an "Unable to cast object of type 'System.DBNull' to
type 'System.String' " exception. I realise what this means, in that at
least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

Dec 14 '06 #1

Subscribe Reply

1207

Laurent Bugnion

Hi,

Mike wrote:

I want to suppress blank lines in an address on a web page.

<snip>

but it fell over with an "Unable to cast object of type 'System.DBNull' to
type 'System.String' " exception. I realise what this means, in that at
least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

You must test the field value against System.DbNull.V alue to check if it
exists in the DB. You must do this *before* you call your method,
because the method expects string parameters. DbNull is not equivalent
to null and can also not be casted to a string.

HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
PhotoAlbum: http://www.galasoft-LB.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch

Dec 14 '06 #2

Mike

Thanks Laurent,

I kind of guessed that was what I had to do, but I'm not sure how to
proceed. I'm thinking of scrapping the standalone method, but using
something similar to accomplish this task in the FormView's DataBinding
event to intercept the values coming from the datareader - test whether they
are DBNulls or not, then doing my thing with them. Does this sound
sensible?
"Laurent Bugnion" <ga*********@bl uewin.chwrote in message
news:uM******** ******@TK2MSFTN GP03.phx.gbl...

Hi,

Mike wrote:
>I want to suppress blank lines in an address on a web page.

<snip>

>but it fell over with an "Unable to cast object of type 'System.DBNull'
to type 'System.String' " exception. I realise what this means, in that
at least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

You must test the field value against System.DbNull.V alue to check if it
exists in the DB. You must do this *before* you call your method, because
the method expects string parameters. DbNull is not equivalent to null and
can also not be casted to a string.

HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
PhotoAlbum: http://www.galasoft-LB.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch

Dec 14 '06 #3

Mike

I've worked this out now. The clue was in the exception message I first
got: "Unable to cast Object...." so I worked out that Eval("SomeValue ")
produces an object.

All I did then was change the method parameters from "string" to "object",
then within the method body, test if the value of <object>.ToStri ng != null.

Works beautifully :-)

Mike

"Mike" <xx*@xxx.xxxwro te in message
news:O3******** *****@TK2MSFTNG P06.phx.gbl...

Thanks Laurent,

I kind of guessed that was what I had to do, but I'm not sure how to
proceed. I'm thinking of scrapping the standalone method, but using
something similar to accomplish this task in the FormView's DataBinding
event to intercept the values coming from the datareader - test whether
they are DBNulls or not, then doing my thing with them. Does this sound
sensible?
"Laurent Bugnion" <ga*********@bl uewin.chwrote in message
news:uM******** ******@TK2MSFTN GP03.phx.gbl...
>Hi,

Mike wrote:
>>I want to suppress blank lines in an address on a web page.

<snip>

>>but it fell over with an "Unable to cast object of type 'System.DBNull'
to type 'System.String' " exception. I realise what this means, in that
at least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

You must test the field value against System.DbNull.V alue to check if it
exists in the DB. You must do this *before* you call your method, because
the method expects string parameters. DbNull is not equivalent to null
and can also not be casted to a string.

HTH,
Laurent
--
Laurent Bugnion, GalaSoft
Software engineering: http://www.galasoft-LB.ch
PhotoAlbum: http://www.galasoft-LB.ch/pictures
Support children in Calcutta: http://www.calcutta-espoir.ch

Dec 14 '06 #4

Steve B.

Change

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1" )%>'></asp:Label> 

by :

<asp:Label ID="Address1Lab el" runat="server" Text='<%# Eval("Address1" ,
"{0} ")% >'></asp:Label>

Repeat this to all of your lines...

It's quite easier that having to test the value...

"Mike" <xx*@xxx.xxxa écrit dans le message de news:
%2************* ***@TK2MSFTNGP0 3.phx.gbl...

>I want to suppress blank lines in an address on a web page.

At the moment, I am displaying the data like this:

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1" )%>'></asp:Label> 
<asp:Label ID="Address2Lab el" runat="server" Text='<%#
Eval("Address2" )%>'></asp:Label> 
<asp:Label ID="Address3Lab el" runat="server" Text='<%# Eval("Address3" )
%>'></asp:Label> 
<asp:Label ID="TownLabel" runat="server" Text='<%#
Eval("Town")%>' ></asp:Label> 
<asp:Label ID="LocationLab el" runat="server" Text='<%# Eval("Location" )
%>'></asp:Label> 
<asp:Label ID="PostcodeLab el" runat="server" Text='<%# Eval("Postcode" )
%>'></asp:Label> 
<asp:Label ID="TelephoneLa bel" runat="server" Text='<%# Eval("Telephone ")
%>'></asp:Label> 
<asp:Label ID="FaxLabel" runat="server" Text='<%#
Eval("Fax")%>'> </asp:Label> 
<asp:Label ID="WebLabel" runat="server" Text='<%#
Eval("Web")%>'> </asp:Label> 

This of course creates blank lines on the page if a line is empty.

I created a method that checks to see if there was anything in the field
and then builds a string including the field, or excluding it depending on
the result:

public static string FormatAddress(s tring ad1, string ad2, string ad3,
string town, string county, string post)
{
string FormattedAddres s ="";
if (ad1 != "")
{ FormattedAddres s = ad1 + " "; }
if (ad2 != "")
{ FormattedAddres s += ad2 + " "; }
if (ad3 != "")
{ FormattedAddres s += ad3 + " "; }
if (town != "")
{ FormattedAddres s += town + " "; }
if (county != "")
{ FormattedAddres s += county + " "; }
if (post != "")
{ FormattedAddres s += post + " "; }
return FormattedAddres s;
}

Then I tried to pass this into it:

<asp:Label ID="FormatAddre ssLabel" runat="server" Text='<%#
MyUtilityClass. FormatAddress(( string)Eval("Ad dress1"),
(string)Eval("A ddress2"), (string)Eval("A ddress3")...%>' ></asp:Label>

but it fell over with an "Unable to cast object of type 'System.DBNull' to
type 'System.String' " exception. I realise what this means, in that at
least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

Dec 14 '06 #5

Mike

Great! Thanks - that's two more things I've learned today!

"Steve B." <st**********@c om.msn_swap_msn _and_comwrote in message
news:uC******** ******@TK2MSFTN GP06.phx.gbl...

Change

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1" )%>'></asp:Label> 

by :

<asp:Label ID="Address1Lab el" runat="server" Text='<%# Eval("Address1" ,
"{0} ")% >'></asp:Label>

Repeat this to all of your lines...

It's quite easier that having to test the value...

"Mike" <xx*@xxx.xxxa écrit dans le message de news:
%2************* ***@TK2MSFTNGP0 3.phx.gbl...
>>I want to suppress blank lines in an address on a web page.

At the moment, I am displaying the data like this:

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1 ")%>'></asp:Label> 
<asp:Label ID="Address2Lab el" runat="server" Text='<%#
Eval("Address2 ")%>'></asp:Label> 
<asp:Label ID="Address3Lab el" runat="server" Text='<%# Eval("Address3" )
%>'></asp:Label> 
<asp:Label ID="TownLabel" runat="server" Text='<%#
Eval("Town")%> '></asp:Label> 
<asp:Label ID="LocationLab el" runat="server" Text='<%# Eval("Location" )
%>'></asp:Label> 
<asp:Label ID="PostcodeLab el" runat="server" Text='<%# Eval("Postcode" )
%>'></asp:Label> 
<asp:Label ID="TelephoneLa bel" runat="server" Text='<%# Eval("Telephone ")
%>'></asp:Label> 
<asp:Label ID="FaxLabel" runat="server" Text='<%#
Eval("Fax")%>' ></asp:Label> 
<asp:Label ID="WebLabel" runat="server" Text='<%#
Eval("Web")%>' ></asp:Label> 

This of course creates blank lines on the page if a line is empty.

I created a method that checks to see if there was anything in the field
and then builds a string including the field, or excluding it depending
on the result:

public static string FormatAddress(s tring ad1, string ad2, string ad3,
string town, string county, string post)
{
string FormattedAddres s ="";
if (ad1 != "")
{ FormattedAddres s = ad1 + " "; }
if (ad2 != "")
{ FormattedAddres s += ad2 + " "; }
if (ad3 != "")
{ FormattedAddres s += ad3 + " "; }
if (town != "")
{ FormattedAddres s += town + " "; }
if (county != "")
{ FormattedAddres s += county + " "; }
if (post != "")
{ FormattedAddres s += post + " "; }
return FormattedAddres s;
}

Then I tried to pass this into it:

<asp:Label ID="FormatAddre ssLabel" runat="server" Text='<%#
MyUtilityClass .FormatAddress( (string)Eval("A ddress1"),
(string)Eval(" Address2"), (string)Eval("A ddress3")...%>' ></asp:Label>

but it fell over with an "Unable to cast object of type 'System.DBNull'
to type 'System.String' " exception. I realise what this means, in that
at least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

Dec 14 '06 #6

Mike

Well, now that I've tried your suggestion, I've found that it doesn't
suppress blank lines if the filed is empty. Nevertheless, I wasn't aware
that you could apply custom formatting in the way you have demonstrated, so
that, together with my improved method is useful.

"Mike" <xx*@xxx.xxxwro te in message
news:%2******** **********@TK2M SFTNGP04.phx.gb l...

Great! Thanks - that's two more things I've learned today!

"Steve B." <st**********@c om.msn_swap_msn _and_comwrote in message
news:uC******** ******@TK2MSFTN GP06.phx.gbl...
>Change

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address1 ")%>'></asp:Label> 

by :

<asp:Label ID="Address1Lab el" runat="server" Text='<%# Eval("Address1" ,
"{0} ")%>'> </asp:Label>

Repeat this to all of your lines...

It's quite easier that having to test the value...

"Mike" <xx*@xxx.xxxa écrit dans le message de news:
%2************ ****@TK2MSFTNGP 03.phx.gbl...
>>>I want to suppress blank lines in an address on a web page.

At the moment, I am displaying the data like this:

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address 1")%>'></asp:Label> 
<asp:Label ID="Address2Lab el" runat="server" Text='<%#
Eval("Address 2")%>'></asp:Label> 
<asp:Label ID="Address3Lab el" runat="server" Text='<%# Eval("Address3" )
%>'></asp:Label> 
<asp:Label ID="TownLabel" runat="server" Text='<%#
Eval("Town")% >'></asp:Label> 
<asp:Label ID="LocationLab el" runat="server" Text='<%# Eval("Location" )
%>'></asp:Label> 
<asp:Label ID="PostcodeLab el" runat="server" Text='<%# Eval("Postcode" )
%>'></asp:Label> 
<asp:Label ID="TelephoneLa bel" runat="server" Text='<%#
Eval("Telepho ne") %>'></asp:Label> 
<asp:Label ID="FaxLabel" runat="server" Text='<%#
Eval("Fax")%> '></asp:Label> 
<asp:Label ID="WebLabel" runat="server" Text='<%#
Eval("Web")%> '></asp:Label> 

This of course creates blank lines on the page if a line is empty.

I created a method that checks to see if there was anything in the field
and then builds a string including the field, or excluding it depending
on the result:

public static string FormatAddress(s tring ad1, string ad2, string ad3,
string town, string county, string post)
{
string FormattedAddres s ="";
if (ad1 != "")
{ FormattedAddres s = ad1 + " "; }
if (ad2 != "")
{ FormattedAddres s += ad2 + " "; }
if (ad3 != "")
{ FormattedAddres s += ad3 + " "; }
if (town != "")
{ FormattedAddres s += town + " "; }
if (county != "")
{ FormattedAddres s += county + " "; }
if (post != "")
{ FormattedAddres s += post + " "; }
return FormattedAddres s;
}

Then I tried to pass this into it:

<asp:Label ID="FormatAddre ssLabel" runat="server" Text='<%#
MyUtilityClas s.FormatAddress ((string)Eval(" Address1"),
(string)Eval( "Address2") , (string)Eval("A ddress3")...%>' ></asp:Label>

but it fell over with an "Unable to cast object of type 'System.DBNull'
to type 'System.String' " exception. I realise what this means, in that
at least one of the fields is null, and this type of casting won't work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

Dec 14 '06 #7

Steve B.

Ok sorry for the error..

you can try this :

<asp:Label ID="Address1Lab el" runat="server" Text='<%# Eval("Address1" ,
"{0} ")% >'
visible='<%# Eval("Address1" ) != System.Data.DBN ull.Value %>'

></asp:Label>

"Mike" <xx*@xxx.xxxa écrit dans le message de news:
er************* **@TK2MSFTNGP06 .phx.gbl...

Well, now that I've tried your suggestion, I've found that it doesn't
suppress blank lines if the filed is empty. Nevertheless, I wasn't aware
that you could apply custom formatting in the way you have demonstrated,
so that, together with my improved method is useful.

"Mike" <xx*@xxx.xxxwro te in message
news:%2******** **********@TK2M SFTNGP04.phx.gb l...
>Great! Thanks - that's two more things I've learned today!

"Steve B." <st**********@c om.msn_swap_msn _and_comwrote in message
news:uC******* *******@TK2MSFT NGP06.phx.gbl.. .
>>Change

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Address 1")%>'></asp:Label> 

by :

<asp:Label ID="Address1Lab el" runat="server" Text='<%# Eval("Address1" ,
"{0} ")%>' ></asp:Label>

Repeat this to all of your lines...

It's quite easier that having to test the value...

"Mike" <xx*@xxx.xxxa écrit dans le message de news:
%2*********** *****@TK2MSFTNG P03.phx.gbl...
I want to suppress blank lines in an address on a web page.

At the moment, I am displaying the data like this:

<asp:Label ID="Address1Lab el" runat="server" Text='<%#
Eval("Addres s1")%>'></asp:Label> 
<asp:Label ID="Address2Lab el" runat="server" Text='<%#
Eval("Addres s2")%>'></asp:Label> 
<asp:Label ID="Address3Lab el" runat="server" Text='<%# Eval("Address3" )
%>'></asp:Label> 
<asp:Label ID="TownLabel" runat="server" Text='<%#
Eval("Town") %>'></asp:Label> 
<asp:Label ID="LocationLab el" runat="server" Text='<%# Eval("Location" )
%>'></asp:Label> 
<asp:Label ID="PostcodeLab el" runat="server" Text='<%# Eval("Postcode" )
%>'></asp:Label> 
<asp:Label ID="TelephoneLa bel" runat="server" Text='<%#
Eval("Teleph one") %>'></asp:Label> 
<asp:Label ID="FaxLabel" runat="server" Text='<%#
Eval("Fax")% >'></asp:Label> 
<asp:Label ID="WebLabel" runat="server" Text='<%#
Eval("Web")% >'></asp:Label> 

This of course creates blank lines on the page if a line is empty.

I created a method that checks to see if there was anything in the
field and then builds a string including the field, or excluding it
depending on the result:

public static string FormatAddress(s tring ad1, string ad2, string ad3,
string town, string county, string post)
{
string FormattedAddres s ="";
if (ad1 != "")
{ FormattedAddres s = ad1 + " "; }
if (ad2 != "")
{ FormattedAddres s += ad2 + " "; }
if (ad3 != "")
{ FormattedAddres s += ad3 + " "; }
if (town != "")
{ FormattedAddres s += town + " "; }
if (county != "")
{ FormattedAddres s += county + " "; }
if (post != "")
{ FormattedAddres s += post + " "; }
return FormattedAddres s;
}

Then I tried to pass this into it:

<asp:Label ID="FormatAddre ssLabel" runat="server" Text='<%#
MyUtilityCla ss.FormatAddres s((string)Eval( "Address1") ,
(string)Eval ("Address2") , (string)Eval("A ddress3")...%>' ></asp:Label>

but it fell over with an "Unable to cast object of type 'System.DBNull'
to type 'System.String' " exception. I realise what this means, in that
at least one of the fields is null, and this type of casting won't
work.

Now I'm stuck. Has anyone got any suggestions?

Thanks

Mike

Dec 14 '06 #8

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The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...

Microsoft Access / VBA

6022

Couldn’t get equations in html when convert word .docx file to html file in C#.

by: conductexam | last post by:

I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...

C# / C Sharp

4528

Trying to create a lan-to-lan vpn between two differents networks

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 the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...

Networking - Hardware / Configuration

2683

How to add payments to a PHP MySQL app.

by: muto222 | last post by:

How can i add a mobile payment intergratation into php mysql website.

PHP