CausesValidation="False"


<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Default</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label2" 
                   runat="server" 
                   Text="Must Be a Date and Earlier than Today"></asp:Label><br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:CompareValidator ID="CompareValidator1" 
                              runat="server" 
                              ControlToValidate="TextBox2"
                              ErrorMessage="TextBox2 Must Be a Date and Earlier than Today" 
                              Operator="LessThan"
                              SetFocusOnError="True" 
                              Type="Date">*</asp:CompareValidator><br />
        <asp:Button ID="Button1" 
                    runat="server" 
                    OnClick="Button1_Click" 
                    Text="Submit" />
        <asp:Button ID="Button2" 
                    runat="server" 
                    CausesValidation="False" 
                    Text="Cancel - Will Not Validate!" />
        <asp:Button ID="Button3" 
                    runat="server" 
                    Text="Validate DropDownList1 Only" 
                    ValidationGroup="DDL" /><br />
        <asp:ValidationSummary ID="ValidationSummary1" runat="server" ShowMessageBox="True" />
        <asp:ValidationSummary ID="ValidationSummary2" 
                               runat="server" 
                               ShowMessageBox="True"
                               ValidationGroup="DDL" />
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    this.CompareValidator1.ValueToCompare = DateTime.Today.ToShortDateString();
    }
  protected void Button1_Click(object sender, EventArgs e)
  {
    this.Validate(string.Empty);
    if (this.IsValid==false)
    {
      // Do something...
    }
  }
}

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CausesValidation="False" : Button « Asp Control « ASP.Net

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