In some conditions we may need to validate a controls based
on the different conditions consider the below example in which we are
validating the same dropdown list from two different validation group Here we
are using the Page_ClientValidate('your validation group name') method which will accept the
validation group name as input
Example:-
<form id="form1" runat="server">
<asp:Button Text="First" runat="server" ValidationGroup="firstVG" />
<asp:Button Text="Second" runat="server" ValidationGroup="secondVG" OnClientClick="return
Check(); " />
<asp:DropDownList runat="server" ValidationGroup="first" ID="ddl">
<asp:ListItem Text="--Select--" Value="-1" />
<asp:ListItem Text="A" />
<asp:ListItem Text="B" />
</asp:DropDownList>
<asp:RequiredFieldValidator ErrorMessage="*" Display="Dynamic" ForeColor="Red" ControlToValidate="ddl" runat="server" InitialValue="-1" ValidationGroup="firstVG"/>
</form>
JavaScript File :-
<script type="text/javascript">
function Check() {
var isValid = false;
isValid = Page_ClientValidate('secondVG');
if (isValid) {
isValid = Page_ClientValidate('firstVG');
}
return isValid;
}
</script>
