Event Handling in custom control

[raghulvarma]

I have created a custom control to get the values and sum them, Here I am able to get display the controls but I am not able to add the values in the text box which means that I am not able to catch the event handling function how is it to be done and
my second question is when I press the sum button the values in the textbox gets erased should I need to set the viewstate property if so how should i do that?
below shown is my code
custom control.cs

      [DefaultEvent("Click")]
      public class WebCustomControl1 : WebControl
      {
      TextBox value1 = new TextBox();
      TextBox value2 = new TextBox();
      Label output = new Label();
      Button sresult = new Button();
      private string showresult;
      protected override void CreateChildControls()
      {
      //base.CreateChildControls();
      value1.TextMode = TextBoxMode.SingleLine;
      Controls.Add(value1);
      Controls.Add(new LiteralControl("<br>"));
      value2.TextMode = TextBoxMode.SingleLine;
      Controls.Add(value2);
      Controls.Add(new LiteralControl("<br>"));
      sresult.Text = "Show Result";
      Controls.Add(sresult);
      Controls.Add(new LiteralControl("<br>"));
      Controls.Add(new LiteralControl("&nbsp&nbspResult:&nbsp<b>"));
      Controls.Add(output);
      Controls.Add(new LiteralControl("</b>"));
      sresult.Click += new EventHandler(btnsumclicked);
      }
      public event EventHandler Click;
      void btnsumclicked(object sender, EventArgs e)
      {
      int a = int.Parse(value1.Text) + int.Parse(value2.Text);
      showresult = a.ToString();
      }
 
      protected virtual void onClick(EventArgs e)
      {
      if (Click != null)
      {
      Click(this, e);
      }
      }
      }
 

In code behind i did not give any thing how should I handle the event in code behind

[furuknap]

Hello,

You need to make sure that CreateChildControls is called early enough in the control life cycle. As you are talking about viewstate I assume you are doing this on an ASP.net web page, so try overriding the onload method and add EnsureChildControls() there:

protected override void OnLoad(EventArgs e)
{
EnsureChildControls();
[...]

If you create the controls too late in the page life cycle the event wireup has already happened and no event handler will fire.

.b