Custom ASP.NET Container Control

Question

I\'ve been trying to create a custom control that works exactly like the Panel control except surrounded by a few divs and such to create a rounded box look. I haven\'t been

Answer 1

There is two ways to do this. One is to implement INamingContainer on your control, and it takes a lot of effort.

The other way is to inherit from Panel, and override the RenderBeginTag and RenderEndTag methods to add your custom markup. This is easy.

public class RoundedCornersPanel : System.Web.UI.WebControls.Panel
{
    public override RenderBeginTag (HtmlTextWriter writer)
    {
        writer.Write("Your rounded corner opening markup");
        base.RenderBeginTag(writer);
    }

    public override RenderEndTag (HtmlTextWriter writer)
    {
        base.RenderEndTag(writer);
        writer.Write("Your rounded corner closing markup");                     
    }
}

Answer 2

public class myCustomPanel : Panel
{
    public override void RenderBeginTag(HtmlTextWriter writer)
    {
        writer.AddAttribute(HtmlTextWriterAttribute.Class, "top_left_corner");
        writer.RenderBeginTag(HtmlTextWriterTag.Div);
            base.RenderBeginTag(writer);
    }

    public override void RenderEndTag(HtmlTextWriter writer)
    {
            base.RenderEndTag(writer);
        writer.RenderEndTag();
    }

}