private void submitBtn_Click(object sender, EventArgs e)
        {
            try
            {
                //int companyId = 0;
                //DatabaseClass db = new DatabaseClass();
                //db.openConnection();
                //var cmd = db.cmd("selectCompany");
                //cmd.CommandType = CommandType.StoredProcedure;
                //cmd.Parameters.AddWithValue("@userName", SqlDbType.NVarChar).Value = userNameTxt.Text.Trim();
                //cmd.Parameters.AddWithValue("@password", SqlDbType.NVarChar).Value = passwordTxt.Text.Trim();
                //DataTable dt = new DataTable();
                //dt.Load(cmd.ExecuteReader());
                //db.closeConnection();

                int           companyId = 0;
                DatabaseClass db        = new DatabaseClass();

                SqlParameter[] param =
                {
                    new SqlParameter("@userName", SqlDbType.NVarChar)
                    {
                        Value = userNameTxt.Text.Trim()
                    },
                    new SqlParameter("@password", SqlDbType.NVarChar)
                    {
                        Value = passwordTxt.Text.Trim()
                    }
                };
                var       command = db.cmd("selectCompany", param);
                DataTable dt      = new DataTable();
                db.openConnection();
                dt.Load(command.ExecuteReader());
                db.closeConnection();

                companyId = dt.Rows[0].Field <int>(0);
                if (dt.Rows.Count > 0)
                {
                    mainForm main = new mainForm(companyId);
                    main.Show();
                    this.Hide();
                }
                else
                {
                    MessageBox.Show("برجاء أدخل اسم مستخدم و كلمة سر صحيحة ");
                }
            }
            catch (Exception es)
            {
                MessageBox.Show("برجاء أدخل اسم مستخدم و كلمة سر");
            }
        }