Update Panel in Radio Button List

  <asp:ScriptManager ID="scriptManager" EnablePartialRendering="true" runat="server" />
      
        <asp:UpdatePanel ID="myUpdatePanel" runat="server">
            <ContentTemplate>
                <asp:Label ID="myLabel" Text="Initial Text" runat="server" />
            </ContentTemplate>
            <Triggers>
             <asp:PostBackTrigger ControlID="myRadioButtonList"/>
            
               
            </Triggers>
        </asp:UpdatePanel>

        <asp:TextBox ID="myTextBox" AutoPostBack="true" OnTextChanged="myTextBox_TextChanged" runat="server" />
               
        <asp:RadioButtonList ID="myRadioButtonList" AutoPostBack="true"
                OnSelectedIndexChanged="myRadioButtonList_SelectedIndexChanged" runat="server">
            <asp:ListItem Value="Radio Button 1" />
            <asp:ListItem Value="Radio Button 2" />
            <asp:ListItem Value="Radio Button 3" />
        </asp:RadioButtonList>