title: Textbox inside an update panel not refreshing
body: <p>I have this in the aspx file.</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" &gt;
                         &lt;ContentTemplate&gt;
              &lt;asp:Label ID="Label1" runat="server" &gt;&lt;/asp:Label&gt;
      &lt;asp:TextBox ID="TextBox1" runat="server"&gt;&lt;/asp:TextBox&gt;
              &lt;asp:Button ID="Button1" runat="server" Text="In side update panel" onclick="Button1_Click" /&gt;            
          &lt;/ContentTemplate&gt;
      &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>and in code behind I have this</p>
  
  <pre><code>protected void Page_Load(object sender, EventArgs e)
  {
  
      Label1.Text =  DateTime.Now.ToString();
      TextBox1.Text = "Some Text";
  }
  
  protected void Button1_Click(object sender, EventArgs e)
  {
  
      UpdatePanel1.Update();
  }
  </code></pre>
  
  <p>However, on <code>Button1_Click</code> I can see the time changes, but the <code>textbox1</code> does not refresh. I tried Triggers and various other tricks but nothing works. Basically, I want to refresh all the controls with in an Update panel from a button_click. I don't know what I am missing here.</p>