RequiredFieldValidator Example using ASP.NET
In this example, we are going to learn about RequiredFieldValidator server side form validation control in ASP.NET.
RequiredFieldValidator required Id, runat, ControlToValidate and ErrorMessage information.
After executing below code we have to click on login button before entering any data. Login button will not work until u will fill the username and password.
Output of the below code:
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| RequiredFieldValidator Example using ASP.NET |
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table style="width:50%;">
<tr>
<td>
<b>User Name:</b></td>
<td>
<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtUserName"
ErrorMessage="Please Enter User Name" Font-Bold="False"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
<b>Password:</b></td>
<td>
<asp:TextBox ID="txtPassword" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ErrorMessage="Please enter password" ControlToValidate="txtPassword"></asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
<asp:Button ID="btnLogin" runat="server" Text="Login" />
</td>
<td>
<asp:Button ID="btnCancel" runat="server"
Text="Cancel" />
</td>
<td>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
This is one of the good ASP.NET Interview Question
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