Use ajax control for check empty

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ASP.NET

Ajax

Could I use the Ajax Control,for validating the empty textBox which is in Template field.

<asp:TemplateField HeaderText="KRA Weightage" AccessibleHeaderText="txtKRAWtg" >
                           <ItemTemplate>
                               <asp:Label ID="Label1" runat="server" Text='<%# Bind("KRAWeightage") %>'></asp:Label>
                               <asp:TextBox ID="txtKRAWtg" runat="server" Height="20px" Width="43px" ValidationGroup="KRAWeightage"></asp:TextBox>
                               <asp:RequiredFieldValidator ID="rfdKRAWtg" runat="server"
                                   ErrorMessage="KRA can't empty" ControlToValidate="txtKRAWtg" ValidationGroup="KRAWeightage"></asp:RequiredFieldValidator>
                           </ItemTemplate>

With the Require Field Validator,I would like to use ajax control to show alert message to user.