How can I pass parameters to a user control that is loaded at into a Placeholder at runtime?

[keith]

I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPlac eHolder.Control s.Add(c);

Immediately after loading the control, I need to set a property of the user
control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null value.
Any suggestions?

Thanks,

Keith

[Eliyahu Goldin]

You already have a reference to the control in variable c. You just need to
typecast it to your type. One of the options:

MyControl c = (MyControl)Page .LoadControl(Re quest.Applicati onPath +
"/User_Controls/website_design. ascx");
c.MyProperty = myValue;

--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"keith" <kb******@dslex treme.comwrote in message
news:u6******** ********@TK2MSF TNGP02.phx.gbl. ..

>I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPlac eHolder.Control s.Add(c);

Immediately after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith

[Vili]

keith wrote:

I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPlac eHolder.Control s.Add(c);

Immediately after loading the control, I need to set a property of the user
control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null value.
Any suggestions?

Thanks,

Keith

Hi Keith

I hope I remember this right (can't check it atm).
Try to set the id property for the control or it will have a generic id.

[keith]

Thanks for your help. I changed my code to:

MyControl c = (MyControl)Page .LoadControl(Re quest.Applicati onPath +
"/User_Controls/website_design. ascx");
c.Item = "abc";
UserControlPlac eHolder.Control s.Add(c);

When I build the page, I get the following error messages:

The type or namespace name 'MyControl' could not be found (are you missing a
using directive or an assembly reference?)

The best overloaded method match for
'System.Web.UI. ControlCollecti on.Add(System.W eb.UI.Control)' has some
invalid arguments

Argument '1': cannot convert from 'MyControl' to 'System.Web.UI. Control'

What am I doing wrong here?

Thanks,

Keith

"Eliyahu Goldin" <RE************ **************@ mMvVpPsS.orgwro te in
message news:ec******** ******@TK2MSFTN GP02.phx.gbl...

You already have a reference to the control in variable c. You just need
to typecast it to your type. One of the options:

MyControl c = (MyControl)Page .LoadControl(Re quest.Applicati onPath +
"/User_Controls/website_design. ascx");
c.MyProperty = myValue;

--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"keith" <kb******@dslex treme.comwrote in message
news:u6******** ********@TK2MSF TNGP02.phx.gbl. ..

>>I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPla ceHolder.Contro ls.Add(c);

Immediately after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith

[keith]

Thanks for answering. How can I set the ID property for the user control?
When I look in Properties, all I see are File Name and Full Path.

-Keith
"Vili" <en*****@spammi a.fiwrote in message
news:46******** *************** @news.fv.fi...

keith wrote:

>I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPla ceHolder.Contro ls.Add(c);

Immediately after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith

Hi Keith

I hope I remember this right (can't check it atm).
Try to set the id property for the control or it will have a generic id.

[Eliyahu Goldin]

Did you include the control in the page?

How to: Include a User Control in an ASP.NET Web Page
http://msdn2.microsoft.com/en-us/library/sbz9etab.aspx
--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"keith" <kb******@dslex treme.comwrote in message
news:uM******** ******@TK2MSFTN GP03.phx.gbl...

Thanks for your help. I changed my code to:

MyControl c = (MyControl)Page .LoadControl(Re quest.Applicati onPath +
"/User_Controls/website_design. ascx");
c.Item = "abc";
UserControlPlac eHolder.Control s.Add(c);

When I build the page, I get the following error messages:

The type or namespace name 'MyControl' could not be found (are you missing
a using directive or an assembly reference?)

The best overloaded method match for
'System.Web.UI. ControlCollecti on.Add(System.W eb.UI.Control)' has some
invalid arguments

Argument '1': cannot convert from 'MyControl' to 'System.Web.UI. Control'

What am I doing wrong here?

Thanks,

Keith

"Eliyahu Goldin" <RE************ **************@ mMvVpPsS.orgwro te in
message news:ec******** ******@TK2MSFTN GP02.phx.gbl...

>You already have a reference to the control in variable c. You just need
to typecast it to your type. One of the options:

MyControl c = (MyControl)Page .LoadControl(Re quest.Applicati onPath +
"/User_Controls/website_design. ascx");
c.MyProperty = myValue;

--
Eliyahu Goldin,
Software Developer & Consultant
Microsoft MVP [ASP.NET]
http://msmvps.com/blogs/egoldin
http://usableasp.net
"keith" <kb******@dslex treme.comwrote in message
news:u6******* *********@TK2MS FTNGP02.phx.gbl ...

>>>I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPl aceHolder.Contr ols.Add(c);

Immediately after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith

[Vili]

Hi

In your code behind when you set the control

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
c.Id = "myId"
UserControlPlac eHolder.Control s.Add(c);

After this you should be able to find the control with FindControl("my Id")

keith wrote:

Thanks for answering. How can I set the ID property for the user control?
When I look in Properties, all I see are File Name and Full Path.

-Keith
"Vili" <en*****@spammi a.fiwrote in message
news:46******** *************** @news.fv.fi...

>keith wrote:

>>I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlPl aceHolder.Contr ols.Add(c);

Immediately after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith

Hi Keith

I hope I remember this right (can't check it atm).
Try to set the id property for the control or it will have a generic id.

[keith]

Thanks for helping. Taking your suggestion, using the following code,
FindControl still turns up a null;

Control c;
c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
c.ID = "website_design _user_control";
UserControlPlac eHolder.Control s.Add(c);
Control thisControl = FindControl("we bsite_design_us er_control");

"Vili" <en*****@spammi a.fiwrote in message
news:46******** *************** @news.fv.fi...

Hi

In your code behind when you set the control

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
c.Id = "myId"
UserControlPlac eHolder.Control s.Add(c);

After this you should be able to find the control with FindControl("my Id")

keith wrote:

>Thanks for answering. How can I set the ID property for the user control?
When I look in Properties, all I see are File Name and Full Path.

-Keith
"Vili" <en*****@spammi a.fiwrote in message
news:46******* *************** *@news.fv.fi...

>>keith wrote:
I use this code to load a user control at runtime:

Control c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
UserControlP laceHolder.Cont rols.Add(c);

Immediatel y after loading the control, I need to set a property of the
user control.
I have tried various ways of directly referencing the control without
success. I have also tried using FindControl, but all I get is a null
value. Any suggestions?

Thanks,

Keith
Hi Keith

I hope I remember this right (can't check it atm).
Try to set the id property for the control or it will have a generic id.

[Vili]

Try to test if you can find the control right after you add it.

keith wrote:

Thanks for helping. Taking your suggestion, using the following code,
FindControl still turns up a null;

Control c;
c = Page.LoadContro l(Request.Appli cationPath +
"/User_Controls/website_design. ascx");
c.ID = "website_design _user_control";
UserControlPlac eHolder.Control s.Add(c);
Control thisControl = FindControl("we bsite_design_us er_control");

[Graham Underwood]

Control tp = (Control)Page.L oadControl("~/[YourControl].ascx");
tp.ID = "[YourControl]";

Type typ = tp.GetType();

System.Reflecti on.PropertyInfo pi = typ.GetProperty ("CategoryId ");

pi.SetValue(tp, [propertyName], null);

[Your PlaceHolder].Controls.Add(t p);