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 are already quite a few answers here, but I just wanted to paste the most basic implementation of this without inheriting from Panel class. So here it goes:

using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

[ToolboxData("<{0}:SimpleContainer runat=server>")]
[ParseChildren(true, "Content")]
public class SimpleContainer : WebControl, INamingContainer
{
    [PersistenceMode(PersistenceMode.InnerProperty)]
    [TemplateContainer(typeof(SimpleContainer))]
    [TemplateInstance(TemplateInstance.Single)]
    public virtual ITemplate Content { get; set; }

    public override void RenderBeginTag(HtmlTextWriter writer)
    {
        // Do not render anything.
    }

    public override void RenderEndTag(HtmlTextWriter writer)
    {
        // Do not render anything.
    }

    protected override void RenderContents(HtmlTextWriter output)
    {
        output.Write("
");
        this.RenderChildren(output);
        output.Write("
");
    }

    protected override void OnInit(System.EventArgs e)
    {
        base.OnInit(e);

        // Initialize all child controls.
        this.CreateChildControls();
        this.ChildControlsCreated = true;
    }

    protected override void CreateChildControls()
    {
        // Remove any controls
        this.Controls.Clear();

        // Add all content to a container.
        var container = new Control();
        this.Content.InstantiateIn(container);

        // Add container to the control collection.
        this.Controls.Add(container);
    }
}

Then you can use it like this:

And from codebehind you can do things like this:

this.btnSubmit.Text = "Click me!";
this.txtName.Text = "Jack Sparrow";