ASP.NET Compare two Input Field Using CompareValidator

ASP.NET compare two input fields value using CompareValidator to validate input fields. The CompareValidator control belongs to System.Web.UI.WebControls

Syntax

<asp:CompareValidator ID="CompareValidator1" runat="server" 
            ControlToCompare="TextBox2" ControlToValidate="TextBox3" 
            ErrorMessage="Password does not match."></asp:CompareValidator>

ASP.NET CompareValidator Control Property

Property	Description
ControlToValidate	Specifies control name which needs to be validate.
Display	Specifies behavior of the error message.
EnableClientScript	Specifies whether or not client-side validation is enabled.
Enabled	Specifies whether or not validation control is enabled or not.
ErrorMessage	Specifies error messageto be display in validation summary.
ForeColor	Specifies error message color.
IsValid	Indicate if associate control passes validation or not.
SetFocusOnError	Set focus on associate control if validation fails.
Text	Specifies text to be display if validation fails.
ValidationGroup	Specifies validation group name.
Validate	Update the isvalid propery.
ValidateGetValidationProperty	Determineing validation property of a control, if it exists.

Equal	This is used to check whether the compared value are equal.
NotEqual	This is used to check whether the compared value are not equal.
GreaterThan	This is used to check whether the compared value are greater than.
GreaterThanEqual	This is used to check whether the compared value are greater than equal
LessThan	This is used to check whether the compared value are less than.
LessThanEqual	This is used to check whether the compared value are less than equal.
DataTypeCheck	This is used to compare data type.

ASP.NET Compare two Input Field Using CompareValidator Example

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="https://www.w3.org/1999/xhtml">
<head runat="server">
   <title>ASP.NET CompareValidator Control Example</title>
</head>
<body>
<form id="Form" runat="server">
<div>
<asp:Label ID="lblTitle" runat="server" Font-Bold="True" Font-Size="Medium" 
	Font-Underline="True" Text="CompareValidator Control Example"></asp:Label>
<br />
<asp:Label ID="lblName" runat="server" Font-Bold="True" Font-Size="Small" 
	Text="User Name:"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server" Width="173px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
	ControlToValidate="TextBox1" ErrorMessage="This Field can not be blank."></asp:RequiredFieldValidator>
<br />
<asp:Label ID="lblPassword" runat="server" Font-Bold="True" Font-Size="Small" 
	Text="Password:"></asp:Label>
<asp:TextBox ID="TextBox2" runat="server" TextMode="Password" Width="173px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
	ControlToValidate="TextBox2" ErrorMessage="This Field can not be blank."></asp:RequiredFieldValidator>
<br />
<asp:Label ID="lblRePassword" runat="server" Font-Bold="True" Font-Size="Small" 
Text="Re-type Password:"></asp:Label>
 <asp:TextBox ID="TextBox3" runat="server" TextMode="Password" Width="173px"></asp:TextBox>
<asp:CompareValidator ID="CompareValidator1" runat="server" 
	ControlToCompare="TextBox2" ControlToValidate="TextBox3" 
	ErrorMessage="Password does not match."></asp:CompareValidator>
<br />
<asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" 
	ControlToValidate="TextBox3" ErrorMessage="This Field can not be blank."></asp:RequiredFieldValidator>
<br />
<asp:Button ID="btnSubmit" runat="server" Font-Bold="True" 
	Font-Size="Small" Text="Submit" />
<br />
</div>
</form>
</body>
</html>

Above example will produce following output