Custom controls and events

[doron]

Hi,
I'm tryig to add a LinkButton with events to a custom control (custom
control : Datagrid)
My CreateChildCont rols is generating an error (Specified cast is not
valid.)
Here is my function:
protected override void CreateChildCont rols()
{
if(FirstLinkBut ton==null)
{
FirstLinkButton =new Button();
FirstLinkButton .Text="<<";
FirstLinkButton .CommandName="F *irst";
FirstLinkButton .ID="FirstLinkB *utton";

}
this.FirstLinkB utton.Command+= new
CommandEventHan dler(this.LinkB *utton_Command) ;
base.CreateChil dControls();
System.Web.UI.H tmlControls.Htm *lTable
htmlTbl=new
System.Web.UI.H tmlControls.Htm *lTable();
System.Web.UI.H tmlControls.Htm *lTableRow
htmlRow=new
System.Web.UI.H tmlControls.Htm *lTableRow();
System.Web.UI.H tmlControls.Htm *lTableCell
htmlCell;
htmlCell=new
System.Web.UI.H tmlControls.Htm *lTableCell();
htmlCell.Contro ls.Add(FirstLin *kButton);
htmlRow.Control s.Add(htmlCell) *;
htmlTbl.Control s.Add(htmlRow);
this.Controls.A dd(htmlTbl);
}
When I remove the function everything is fine. (No error)

What am I missing here?

Thank you,

Doron.

[Jon Skeet [C# MVP]]

doron <do*****@amdocs .com> wrote:

I'm tryig to add a LinkButton with events to a custom control (custom
control : Datagrid)

My CreateChildCont rols is generating an error (Specified cast is not
valid.)

What line does it say the error is occurring on?

Have you tried calling the base implementation
(base.CreateChi ldControls()) at the start of the method?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[doron]

I tryde to move the base.Create... and got the same result.

In debug I'm reaching the last row ( this.Controls.A dd(htmlTbl); ) and
only after it the error apears.

this is the full error: (no row number)

Server Error in '/Tests' Application.
--------------------------------------------------------------------------------

Specified cast is not valid.
Description: An unhandled exception occurred during the execution of
the current web request. Please review the stack trace for more
information about the error and where it originated in the code.

Exception Details: System.InvalidC astException: Specified cast is not
valid.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.
Stack Trace:
[InvalidCastExce ption: Specified cast is not valid.]
System.Web.UI.W ebControls.Data Grid.PrepareCon trolHierarchy()
System.Web.UI.W ebControls.Base DataList.Render (HtmlTextWriter writer)
System.Web.UI.C ontrol.RenderCo ntrol(HtmlTextW riter writer)
System.Web.UI.C ontrol.RenderCh ildren(HtmlText Writer writer)
System.Web.UI.H tmlControls.Htm lForm.RenderChi ldren(HtmlTextW riter
writer)

System.Web.UI.H tmlControls.Htm lContainerContr ol.Render(HtmlT extWriter
writer)
System.Web.UI.H tmlControls.Htm lForm.Render(Ht mlTextWriter output)
System.Web.UI.C ontrol.RenderCo ntrol(HtmlTextW riter writer)
System.Web.UI.C ontrol.RenderCh ildren(HtmlText Writer writer)
System.Web.UI.C ontrol.Render(H tmlTextWriter writer)
System.Web.UI.C ontrol.RenderCo ntrol(HtmlTextW riter writer)
System.Web.UI.P age.ProcessRequ estMain()

[Jon Skeet [C# MVP]]

doron <do*****@amdocs .com> wrote:

I tryde to move the base.Create... and got the same result.

In debug I'm reaching the last row ( this.Controls.A dd(htmlTbl); ) and
only after it the error apears.

this is the full error: (no row number)

<snip>

I don't know then, I'm afraid. I suggest you ask in the ASP.NET group,
preferrably with a short but complete example which demonstrates the
problem.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too