ASP.NET Validation Controls - Conditionally validating

Using the server side Page.Validate() and Client Side Page_ClientValidate() , we can validate a group of controls conditionally. For eg. i just need to validate some fields only when a checkbox is checked. Both Page.Validate() and Page_ClientValidate() allows to pass a validation group , So we group a set of controls with a validation group and calls this validation functions in both client & server side only on the required validation condition

Server Side

protected void btnSubmit_Click(object sender, EventArgs e)
 {
     if(cbValidate.Checked)
     {
         //validate
         Validate("vgSubmit");
     }
     if (!IsValid) return;
     lblMsg.Text = "Passed validation";
 }

ClientSide

        function CheckValidation() {
            var cbValidate = document.getElementById('<%=cbValidate.ClientID %>');
            var flag = true;
            if (cbValidate.checked) {
                if (!Page_ClientValidate("vgSubmit"))
                    flag = false;
            }
            else {
                Page_ClientValidate("vgDummy")
            }                 
            return flag;
            
        }

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