CausesValidation: Whether Validation is performed or not , you can check using CausesValidation property,after button click. Bydefault page validation is performed with all control, which is associated with validation control. If CausesValidation is true, page validate all control , which is associated with validation control. If CausesValidation is false , manually validate the control by the user.
Lets Take an Simple Example
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
Enter Your Name :
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><asp:RequiredFieldValidator
ID="RequiredFieldValidator1" EnableClientScript ="false" ControlToValidate ="TextBox1" runat="server" ErrorMessage="Validate your name"></asp:RequiredFieldValidator><br />
<asp:Button ID="Button1" runat="server" Text="Button" CausesValidation="False"
onclick="Button1_Click" />
</div>
<asp:Label ID="Label1" runat="server"></asp:Label>
</form>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default4 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
RequiredFieldValidator1.Validate();
if (RequiredFieldValidator1 .IsValid)
{
Label1.Text = "Entered Name is " + TextBox1.Text;
}
}
}
Code Generate the following output
