How to use validation on Text Box in windows applications c#

ya i got it ....
 
Thanks.

It show the error 

 errorProvider1 is does not exist....

Here i am getting error on   

    errorProvider1.SetError(textBox1, "You have entered 0");

Hi Sri,


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (Convert.ToBoolean(textBox1.Text == "0"))
            {
                errorProvider1.SetError(textBox1, "You have entered 0");
            }
            else
            {
                errorProvider1.Clear();
            }

        }
    }
}



Thanks

You can use error provider control and make it fires when your value is 0

check here for error provider 

http://www.dotnetperls.com/errorprovider