title: Problem with "Update panel" control
body: <p>i am using ASP.NET in which i am using Ajaxcontroltoolkit and "update panel" control for update part of the page.<br>
  it works fine first time when i run the program, but from second time the "update panel" control doesn't work. i can give more details about it, any idea what is the problem?  </p>
  
  <pre><code>&lt;asp:UpdatePanel ID="UpdatePanel1" runat="server"&gt;
              &lt;ContentTemplate&gt;
                  &lt;table border="1" id="tbRegistration" style="font-family: Calibri" width="800px"&gt;
                      &lt;tr&gt;
                          &lt;td style="width: 33%" align="center"&gt;
                              &lt;asp:RadioButton ID="rbIndividual" runat="server" OnCheckedChanged="RadioButton_CheckedChanged"
                                  Text="Individual" GroupName="Profile" AutoPostBack="true" /&gt;
                          &lt;/td&gt;
                          &lt;td style="width: 33%" align="center"&gt;
                              &lt;asp:RadioButton ID="rbAgent" runat="server" OnCheckedChanged="RadioButton_CheckedChanged"
                                  Text="Agent" GroupName="Profile" AutoPostBack="true" /&gt;
                          &lt;/td&gt;
                          &lt;td style="width: 33%" align="center"&gt;
                              &lt;asp:RadioButton ID="rbBuilder" runat="server" OnCheckedChanged="RadioButton_CheckedChanged"
                                  Text="Builder" GroupName="Profile" AutoPostBack="true" /&gt;
                          &lt;/td&gt;
                      &lt;/tr&gt;
                  &lt;/table&gt;
              &lt;/ContentTemplate&gt;
          &lt;/asp:UpdatePanel&gt;
  </code></pre>