ASP.NET RequiredFieldValidator Control

ASP.NET RequiredFieldValidator is used to validate whether user enter data into input control or not. The RequiredFieldValidator control belongs to System.Web.UI.WebControls

Syntax

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

ASP.NET RequiredFieldValidator 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.

InitialValue	Specifies initial value of input control.

ASP.NET RequiredFieldValidator Control Example

<code><%@ 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 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>
</code>

Above example will produce following output

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ASP.NET Validation Controls 37

RequiredFieldValidator

RequiredFieldValidator - Form Validation

Set focus on error RequiredFieldValidator

Set initial default value using initialValue property - RequiredFieldValidator

Display summary popup for all require field

Grouping in RequiredFieldValidator using validationGroup property

Display image notification for require field

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Enable disable RequiredFieldValidator client-side

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RegularExpressionValidator

Email validation using RegularExpressionValidator

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RangValidator

Check minimum and maximum value using RangeValidator

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Minimum Maximum value, ControlToValide and ErrorMessage property of RangeValidator

CompareValidator

Compare two input control using CompareValidator

Check data type using CompareValidator

Compare data type operator using CompareValidator

Constant using CompareValidator

Check currency, date, string, integer using CompareValidator

Confirm password using CompareValidator

Disable client side validation using CompareValidator

Age compare using CompareValidator

CustomValidator

Associate CustomValidator to control

Validation client and server side using CustomValidator

ValidationSummary

Display a list of error message using ValidationSummary

Display popup message using ValidationSummary

Different display mode of ValidationSummay

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