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ASP.NET Set Focus On Error : RequiredFieldValidator Controls

ASP.NET set focus on error in RequiredFieldValidator control to ensure that the user has entered the data into input control. The RequiredFieldValidator control belongs to System.Web.UI.WebControls

Syntax

<RequiredFieldValidator
id="reqFirstName" ControlToValidate="TextBox1" Text="(Required)"
SetFocusOnError="true" Runat="server"></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.
RequiredFieldValidatorSpecifies required field value.

ASP.NET Set Focus On Error : RequiredFieldValidator Controls Example

<%@ 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 Example</title>
</head>
<body>
<form id="Form" runat="server">
<div style="width: 619px">
<asp:Label ID="lblTitle" runat="server" Font-Bold="True" Font-Size="Medium" 
Font-Underline="True" Text="ASP.NET Required Field Validation Example"></asp:Label><br /><br />
<table border="0" width="600px" cellpadding="0" cellspacing="0">
<tr><td>
<asp:Label ID="lblName" runat="server" Font-Bold="True" Font-Size="Small" 
Text="Enter Name:"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server" Width="177px"></asp:TextBox>
<asp:RequiredFieldValidator
id="reqFirstName" ControlToValidate="TextBox1" ErrorMessage="Name is required."
SetFocusOnError="true" Runat="server"></asp:RequiredFieldValidator>
</td></tr>
<tr><td>
<asp:Button ID="btnSubmit" runat="server" Font-Bold="True" 
Font-Size="Small" Text="Submit" Width="60px" />
</td></tr>
</table>   
</div> 
</form>
</body>
</html>

Above example will produce following output

RequiredFieldValidator

RegularExpressionValidator

RangValidator

CompareValidator

CustomValidator

ValidationSummary