I'm using required field validator to validate textbox.
<tr>
<td>
<asp:Label ID="lbllogin" runat="server" Text="Registration ID"></asp:Label>
</td>
<td>
<asp:TextBox ID="txtloginid" runat="server" AutoPostBack="true"
ontextchanged="txtloginid_TextChanged" TabIndex="1"
ToolTip="Enter Registration Id" Width="150px"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="reqloginid" runat="server"
ControlToValidate="txtloginid" Display="Dynamic" ErrorMessage="*"
ToolTip="Enter Registration Id" ValidationGroup="User_login"
ForeColor="#CC3300" SetFocusOnError="True"></asp:RequiredFieldValidator>
</td>
</tr>
Now i want to add color to textbox , how can i do it with required filed validator. i'm using updatepanel. thanks in advance