ASP.NET Form validation using requiredfieldvalidator

The RequiredFieldValidator is used to ensure that the user has entered the data into input control. The RequiredFieldValidator control belongs to System.Web.UI.WebControls

Syntax

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

ASP.NET RequiredFieldValidator Control Property

PropertyDescription
ControlToValidateSpecifies control name which needs to be validate.
DisplaySpecifies behavior of the error message.
EnableClientScriptSpecifies whether or not client-side validation is enabled.
EnabledSpecifies whether or not validation control is enabled or not.
ErrorMessageSpecifies error messageto be display in validation summary.
ForeColorSpecifies error message color.
IsValidIndicate if associate control passes validation or not.
SetFocusOnErrorSet focus on associate control if validation fails.
TextSpecifies text to be display if validation fails.
ValidationGroupSpecifies validation group name.
ValidateUpdate the isvalid propery.
ValidateGetValidationPropertyDetermineing validation property of a control, if it exists.
InitialValueSpecifies initial value of input control.

Example RequiredFieldValidator - Default.aspx

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" 
Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>ASP.NET RequiredFieldValidator Control Example</title>
</head>
<body>
<form id="Form" runat="server">       
<div>
<asp:Label ID="Label1" runat="server" 
    Text="RequiredField Validator Control Example" Font-Bold="True" 
    Font-Size="Medium" Font-Underline="True"></asp:Label>
<br /><br />
<asp:Label ID="lblName" runat="server" Font-Bold="True" Font-Size="Small" 
    Text="User name:"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server" Height="22px" Width="175px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
    ControlToValidate="TextBox1" ErrorMessage="User name can not be empty"></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" Height="22px" TextMode="Password" 
    Width="175px"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" 
    ControlToValidate="TextBox2" ErrorMessage="Password can not be empty"></asp:RequiredFieldValidator>
<br /><br />
<asp:Button ID="btnSubmit" runat="server" 
    Font-Size="Medium" Text="Submit" />
</div>
</form>
</body>
</html>

Above example will produce following output

More ASP.NET RequiredFieldValidator Controls

 
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