Asp.net requiredfieldvalidator examlpe

Asp.net requiredfieldvalidator is used to make an input control as required field(mandatory). If you want to associate the requiredfieldvalidator to a textbox then you have to give the textbox id to requiredfieldvalidator ControlToValidate property.

Syntax

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Name Required" ForeColor="Red" ControlToValidate="txtName"></asp:RequiredFieldValidator>

Example

ASPX Page

<%@ 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> Name:<br /> <asp:TextBox ID="txtName" runat="server"></asp:TextBox><br /> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Name Required" ForeColor="Red" ControlToValidate="txtName"></asp:RequiredFieldValidator> <br /> <br /> <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" /> <br /> <br /> <asp:Label ID="lblMessage" runat="server" Style="color: Green; font-size: 18px; font-weight: bold;"></asp:Label> </div> </form> </body> </html>

ASPX Page

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Data; using System.Globalization; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void btnSubmit_Click(object sender, EventArgs e) { lblMessage.Text = "Submitted successfully."; } }