You should probably be storing those values in ViewState between postbacks.
Here's an example of a custom control that uses ViewState to store similar
custom values and retrieve them again when needed.
http://SteveOrr.net/articles/InheritAndExtend.aspx
--
I hope this helps,
Steve C. Orr, MCSD, MVP
http://SteveOrr.net
"James T." <gimenei@hotmail.com> wrote in message
news:eXOwwA%23WFHA.3348@TK2MSFTNGP14.phx.gbl...[color=blue]
> Hello!
>
> I developed a composite control that inherits from HyperLink and overrides
> Render method.
>
> In web form I am using this control with DataGrid. On DataGrid
> ItemDataBound event I set ImageWidth and ImageHeight values
> programmatically. But on post-back the control loses ImageWidth and
> ImageHeight values.
>
> What I am doing wrong?
>
> Thank you!
> James
>
>
> CODE:
> -----------------------
>
> Protected Overrides Sub Render(ByVal Output As
> System.Web.UI.HtmlTextWriter)
>
> Output.AddAttribute(HtmlTextWriterAttribute.Href, Me.NavigateUrl)
> Output.RenderBeginTag(HtmlTextWriterTag.A)
>
> If ImageUrl.Length = 0 Then
> Output.Write([Text])
> Else
>
> Output.AddAttribute(HtmlTextWriterAttribute.Src, ImageUrl)
> Output.AddAttribute(HtmlTextWriterAttribute.Alt, [Text])
> Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
> Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)
>
> If Not (ImageHeight Is Nothing) Then
> Output.AddAttribute(HtmlTextWriterAttribute.Height , ImageHeight)
> End If
>
> If Not (ImageWidth Is Nothing) Then
> Output.AddAttribute(HtmlTextWriterAttribute.Width, ImageWidth)
> End If
>
> Output.RenderBeginTag(HtmlTextWriterTag.Img)
> Output.RenderEndTag()
>
> End If
> Output.RenderEndTag()
>
> End Sub
>[/color]
A composite control 
