Required field validation not working with Ajax combobox
Reason:-
Combobox doesn't rendered as a dropdownlist. Infact,it is interpreted as a textbox.So,required field validation with initial value attritube="(selected value)" will not work.It required to set initial
value = "--Select--" in order for combobox satisfied your required field validation.
<asp:ComboBox ID="ComboEMINo" runat="server" AutoPostBack="true" >
</asp:ComboBox>
<asp:RequiredFieldValidator ID="rfvEMINo" ControlToValidate="ComboEMINo" runat="server"
ErrorMessage="Select EMINo." ForeColor="Red" InitialValue="--Select--">*</asp:RequiredFieldValidator>
