title: UpdatePanel Does Not Update with Preloaded Data
body: <p>I have an update panel with some textboxes and a button inside. When nothing is preloded into the textbox and I enter the data and click on the button the update panel works fine, but when data is preloaded onto the textbox onload, the update panel would not update my data and the server does not grab the data that was entered onto the textbox. Below is a sample code. Please help.</p>
  
  <pre><code>    &lt;asp:UpdatePanel runat="server" id="UpdatePanel1" UpdateMode="Conditional"&gt;           
          &lt;ContentTemplate&gt;
              &lt;asp:TextBox runat="server" Columns="30" MaxLength="50" ID="tbxPhone" onblur="PhoneBlur(this)"&gt;&lt;/asp:TextBox&gt;
              &lt;asp:Button ID="findOrderBtn" runat="server" OnClientClick="test()" OnClick="btnSearch_Click" Text="Search..." /&gt;
          &lt;/ContentTemplate&gt;
          &lt;Triggers&gt;
              &lt;asp:AsyncPostBackTrigger ControlID="findOrderBtn" EventName="Click" /&gt;
          &lt;/Triggers&gt;
      &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>Below is an example of the code behind:</p>
  
  <pre><code>protected void btnSearch_Click(object sender, EventArgs e)
  {
      string phone = tbxPhone.Text;
  }
  </code></pre>
  
  <p>So if tbxPhone Textbox is originally "555-555-5555" on page_load and I change it to "222-222-2222" and click on the Search... button, the data is returned is "555-555-5555" instead of "222-222-2222"</p>