Using Page_ClientValidate function using JavaScript in ASP.Net

Hi SivaBanu,

I have created sample please check.

HTML

<div>
    <asp:TextBox runat="server" ID="txtName" ValidationGroup="g" placeholder="Name" />
    <asp:RequiredFieldValidator ID="rfvName" runat="server" ValidationGroup="g" ControlToValidate="txtName"></asp:RequiredFieldValidator>
    &nbsp; &nbsp; &nbsp;
    <asp:Button Text="Validate" runat="server" ID="btnValidate" ValidationGroup="g" OnClientClick="Validate();" />
</div>

Script

<script type="text/javascript">
    function Validate() {
        if (Page_ClientValidate("g")) {
            alert("Valid");
        } else {
            alert("Name Required.");
        }
    }
</script>

Screenshot