private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
            mainw frm2 = new mainw();

            frm2.Close();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            SqlConnection sqlcon = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Ayesh Dulanja\Documents\Visual Studio 2015\Projects\WB\userdb.mdf;Integrated Security=True;Connect Timeout=30");
            // string query = "Select * from users Where username = '******' and password ='******'";
            SqlDataAdapter sda = new SqlDataAdapter("SELECT COUNT(*) FROM [users] WHERE username = '******' AND password ='******'", sqlcon);
            DataTable      dt  = new DataTable();

            sda.Fill(dt);
            if (dt.Rows[0][0].ToString() == "1")
            {
                mainw mw = new mainw();
                this.Hide();
                mw.Show();
            }
            else
            {
                MessageBox.Show("User Name or Password are Incorrect", "Login Failed");
            }
            txtun.Clear();
            txtpw.Clear();
        }