private void button1_Click(object sender, EventArgs e)
        {
            this.Hide();
            StaffForm SF = new StaffForm();

            SF.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
            StaffForm sf = new StaffForm();

            sf.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection conn = new SqlConnection(@"Data Source=DESKTOP-24KK9O8\SQLEXPRESS;Initial Catalog=PharmacyDatabase;Persist Security Info=True;User ID=sa;Password=iluvumerijan");

            conn.Open();
            String        query   = "select Role from UserTable where UserID =( select UserId from LoginTable where UserName='******'and Password='******')";
            SqlCommand    command = new SqlCommand(query, conn);
            SqlDataReader reader  = command.ExecuteReader();

            //sda.Fill(dt);
            if (reader.HasRows == true)
            {
                reader.Read();
                if (int.Parse(reader["Role"].ToString()) == 1)
                {
                    this.Hide();
                    StaffForm fm = new StaffForm();
                    MessageBox.Show("Staff");
                    fm.Show();
                    conn.Close();
                }
                else if (int.Parse(reader["Role"].ToString()) == 2)
                {
                    this.Hide();
                    AdminForm fm = new AdminForm();
                    MessageBox.Show("Admin");
                    fm.Show();
                    conn.Close();
                }
                else if (int.Parse(reader["Role"].ToString()) == 3)
                {
                    this.Hide();
                    StockIncharge SI = new StockIncharge();
                    MessageBox.Show("Stock");
                    SI.Show();
                    conn.Close();
                }
                else
                {
                    MessageBox.Show("Check ur username and password");
                }
            }
            else
            {
                MessageBox.Show("Invalid username and password", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }