private void btnInsert_Click(object sender, EventArgs e)
        {
            Employees emp = new Employees();

            emp.FirstName = txtFirstName.Text;
            emp.LastName  = txtLastName.Text;
            emp.Title     = cboTitle.Text;

            northwindEntities dc = new northwindEntities();

            dc.Employees.Add(emp);
            dc.SaveChanges();

            GetEmployees();
        }
        private void btnUpdate_Click(object sender, EventArgs e)
        {
            int RowIndex   = dataGridView1.CurrentCell.RowIndex;
            int EmployeeID = Convert.ToInt32(dataGridView1.Rows[RowIndex].Cells[0].Value);

            northwindEntities dc  = new northwindEntities();
            Employees         emp = dc.Employees.Find(EmployeeID);

            emp.FirstName = EditFirstName.Text;
            emp.LastName  = EditLastName.Text;
            emp.Title     = EditTitle.Text;

            dc.Entry(emp).State = EntityState.Modified;
            dc.SaveChanges();

            GetEmployees();
        }
 private void btnDelete_Click(object sender, EventArgs e)
 {
     if (MessageBox.Show("確定要刪除嗎?", "刪除確認", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
     {
         northwindEntities dc = new northwindEntities();
         int       EmployeeID = Convert.ToInt32(txtEmployeeID.Text);
         Employees emp        = dc.Employees.Find(EmployeeID);
         if (emp == null)
         {
             MessageBox.Show(string.Format("找不到員工編號為{0}的記錄!", EmployeeID));
         }
         else
         {
             dc.Employees.Remove(emp);
             dc.SaveChanges();
             GetEmployees();
         }
     }
 }