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Sunday, February 23, 2014

RequiredFieldValidator example in Asp.Net

In this post we will see an example of how to use RequiredFieldValidator in Asp.Net.

There are different types of validation controls are provided by Asp.Net. Also you can check out:

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- RequiredFieldValidator will show error message if a user try to submit with out entering a value in the field.

- To use RequiredFieldValidator, drag and drop a RequiredFieldValidator from Toolbox.

Here ControlToValidate property field needs to be set as on which field you want to validate. And ErrorMessage property will show what ever error message you will give.

Below is the full HTML code

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ValidatorExamples.aspx.cs"
    Inherits="ValidatorExamples" %>

<!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>RequiredFieldValidator example in Asp.Net</title>
    <form id="form1" runat="server">
        Enter First Name:<asp:TextBox ID="txtFirstName" runat="server"></asp:TextBox><br />
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ForeColor="Red" ErrorMessage="Enter First Name!"
            ControlToValidate="txtFirstName"></asp:RequiredFieldValidator><br />
        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />

If you try to submit enter without filling any value in the Textbox then you will get the error message as shown in the figure below: