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Set False to CausesValidation property of Button, LinkButton, and ImageButton control
then clicking the button bypasses any validation in the page.
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void btnCancel_Click(Object sender, EventArgs e)
{
Response.Redirect("~/Default.aspx");
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Disable Validation</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label
id="lblFirstName"
Text="First Name:"
AssociatedControlID="txtFirstName"
Runat="server" />
<asp:TextBox
id="txtFirstName"
Runat="server" />
<asp:RequiredFieldValidator
id="reqFirstName"
ControlToValidate="txtFirstName"
Text="(Required)"
Runat="server" />
<asp:Button
id="btnSubmit"
Text="Submit"
Runat="server" />
<asp:Button
id="btnCancel"
Text="Cancel"
OnClick="btnCancel_Click"
CausesValidation="false"
Runat="server" />
</div>
</form>
</body>
</html>
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