PASSWORD Change option to LOGIN Form in Dot Net

This is a C# Practice code:

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;
using System.Data.SqlClient;


namespace dataentry
{
    public partial class PASSWORDChange : Form
    {
        public PASSWORDChange()
        {
            InitializeComponent();
        }


        private void button11_Click(object sender, EventArgs e)
        {
            this.Hide();
           // Form1 F1 = new Form1();
            //F1.Show();
        }
        SqlConnection CON = new SqlConnection("Data Source=.;Initial Catalog=dataentry;Integrated Security=True;Pooling=False");
        private void button10_Click(object sender, EventArgs e)
        {
            SqlDataAdapter ASDF = new SqlDataAdapter("SELECT COUNT(*) FROM LOGINWINDOW WHERE USERNAME='"+textBox1.Text+"' AND PASS='"+textBox2.Text+"'",CON);
            DataTable DS = new DataTable();
            ASDF.Fill(DS);
            errorProvider1.Clear();
            if (DS.Rows[0][0].ToString() == "1")
            {
                if (textBox3.Text == textBox4.Text)
                {
                    if (textBox3.Text.Length > 6)
                    {
                        SqlDataAdapter cc = new SqlDataAdapter("update LOGINWINDOW set pass='" + textBox3.Text + "'where username='" + textBox1.Text + "' and pass='" + textBox2.Text + "' ", CON);
                        DataTable DF = new DataTable();
                        cc.Fill(DF);
                        MessageBox.Show("Password Changed..!!", "message", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                    {
                        errorProvider1.SetError(textBox3,"SET MINIMUN 6 CHARECTOR...!!");
                    }
                }
                else
                {
                    errorProvider1.SetError(textBox3,"UnMatch Password");
                    errorProvider1.SetError(textBox4, "UnMatch Password");
                }
            }
            else
            {
                errorProvider1.SetError(textBox1,"incorrect user name");
                errorProvider1.SetError(textBox2, "incorrect password");
            }
        }
    }
}

Video For Result:

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