Friday, November 27, 2009

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 (!IsValid) return;
lblMsg.Text = "Passed validation";


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


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