When I test pages locally the client side validation works good. When I upload to my webhost the client side validation doesn't perform - it does the validation after a postback to the server. I thought maybe this was because I'm using custom controls and those have the validation in them, but then I created a simple page with validation:<BR><BR><asp:TextBox id="TextBox1" runat="server"></asp:TextBox><BR><BR><asp:RequiredFieldVa lidator id="RequiredFieldValidator1" runat="server" ErrorMessage="Required!" ControlToValidate="TextBox1"></asp:RequiredFieldValidator><BR><BR><asp: Button id="Button1" runat="server" Text="Button"></asp:Button><BR><BR>Again, when I test locally the validation happens client side. When I test on my web host it causes a postback before validating. I tried the page with 3 different computers and using both NS and IE and on my host it always does the postback.<BR><BR>Is this something my host has setup differently in IIS or something?