ASP.NET Grouping using RequiredFieldValidator

ASP.NET grouping is implemented by setting ValidationGroup property of RequiredFieldValidator to ensure that the user has entered the data into input control. The RequireField control belongs to System.Web.UI.WebControls

Syntax

<asp:RequiredFieldValidator id="reqUserName"
ControlToValidate="txtUserName" Text="(Required)"
ValidationGroup="LoginGroup" Runat="server" />

ASP.NET RequireFieldValidator 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 Grouping using RequiredFieldValidator 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 Group 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 RequiredFieldValidator Grouping Example"></asp:Label><br /><br /> 
<fieldset>
<table border="0" width="600px" cellpadding="2" cellspacing="0">  
<tr><td>  
<asp:Label id="lblUserName" Text="Employee G1 Name:"
AssociatedControlID="txtUserName" Runat="server" />
          
<asp:TextBox id="txtUserName" Runat="server" />  
<asp:RequiredFieldValidator id="reqUserName"
ControlToValidate="txtUserName" Text="(Required)"
ValidationGroup="LoginGroup" Runat="server" />  
</td></tr> 

<tr><td>  
<asp:Label id="lblPassword" Text="Employee G1 Password:"
AssociatedControlID="txtPassword" Runat="server" />
          
<asp:TextBox id="txtPassword" TextMode="Password"
Runat="server" /> 
<asp:RequiredFieldValidator id="reqPassword"
ControlToValidate="txtPassword" Text="(Required)"
ValidationGroup="LoginGroup" Runat="server" />  
</td></tr> 
<tr><td>
<asp:Button id="btnLogin" Text="G1 Login"
ValidationGroup="LoginGroup" Runat="server" />
</td></tr> 

<tr><td>  
<asp:Label id="lblFirstName"
Text="Employee G2 Name:" AssociatedControlID="txtFirstName"
Runat="server" />
          
<asp:TextBox id="txtFirstName" Runat="server" />  
<asp:RequiredFieldValidator id="reqFirstName"
ControlToValidate="txtFirstName" Text="(Required)"
ValidationGroup="RegisterGroup" Runat="server" /> 
</td></tr> 

<tr><td>  
<asp:Label id="lblEmpG2" Text="Employee G2 Password::"
AssociatedControlID="txtPassword" Runat="server" />
          
<asp:TextBox id="txtPassG2" Runat="server" TextMode="Password"/>
<asp:RequiredFieldValidator id="reqLastName"
ControlToValidate="txtPassG2" Text="(Required)"
ValidationGroup="RegisterGroup" Runat="server" />  
</td></tr> 
<tr><td>
<asp:Button id="btnRegister"
Text="G2 Login" ValidationGroup="RegisterGroup"
Runat="server" />
</td></tr> 

</table>  
</fieldset> 
</div>   
</form>
</html>

Above example will produce following output