private void Button4_Click(object sender, EventArgs e)
        {
            SqlConnection sqlcon = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Hp\source\repos\student_04\student_04\Database_1.mdf;Integrated Security=True;Connect Timeout=30");
            string query = "select * from Adminlogin_Table where username = '" + textBox1.Text.Trim() + "' and password = '" + textBox2.Text.Trim() + "'";
            SqlDataAdapter sda = new SqlDataAdapter(query, sqlcon);
            DataTable dtbl = new DataTable();
            sda.Fill(dtbl);
            if (dtbl.Rows.Count == 1)
            {
                Form2 objForm2 = new Form2();
                 this.Hide();
                objForm2.Show();
            }
            else
            {
                MessageBox.Show("Username or Password is Incorrect", "Alert");
                count++;
                if (count == 3)
                {
                    MessageBox.Show("Tried more than 3 times the program will terminate", "Alert");
                    Application.Exit();
                }
            }

        }