I have a list of users stored in a database table. On the sign up form I simply want to check that the email address a user types in, does not already exist on the system. Here is where I am coming unstuck. I need to check this upon the onblur client side event.
OK So theoretcially this is what I need
<asp:CustomValidator ID="cv1" runat="server" ErroMessage="That email already exists" ClientValidationFunction="CheckEmail"></asp:CustomValidator>
<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
// I need to some how take the return value and assign it to the args.IsValid thus validating the Custom Validator but I do not know how to get this value in the callback function up to the args variable or to the custom validator object.
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