title: text changed event not fired
body: <p>I need to add 1 event for textbox into my webpage (created in ASP.NET with C#) and I was declared in the Page_Load function and into asp syntax:</p>
  
  <pre><code> protected void Page_Load(object sender, EventArgs e)
      {
          textbox1.TextChanged += new EventHandler(textbox1_TextChanged);
      }
  
  public void textbox1_TextChanged(object sender, EventArgs e)
  {
      if (textbox1.Text == "ABCD")
      {
          Image1.Visible = true;
          textbox1.Enabled = false;
      }
  }
  </code></pre>
  
  <p>and into asp page i used this statement:</p>
  
  <pre><code>&lt;asp:TextBox Width="200" ID="textbox1" runat="server"&gt;&lt;/asp:TextBox&gt;
  </code></pre>
  
  <p>I did debug and found that not execute <strong>textbox1_TextChanged</strong> function</p>
  
  <p><strong><em>Why ?</em></strong></p>