private void Ok()
 {
     try
     {
         nhanVien n = new nhanVien();
         if (nv.timkiem("UserName", UserName.Text).Rows.Count > 0)
         {
             UserName.SelectAll();
             PassWord.Text = "";
             Retype.Text   = "";
             UserName.Focus();
             MessageBox.Show("User already exists");
         }
         else
         {
             if (PassWord.Text == Retype.Text)
             {
                 n.maNV     = UserName.Text;
                 n.hoTen    = fullName.Text;
                 n.ngaySinh = BirthDay.Value.ToShortDateString();
                 n.sdt      = PhoneNumber.Text;
                 n.passWord = PassWord.Text;
                 if (n.isNull())
                 {
                     toolTip1.ToolTipTitle = "Warning";
                     toolTip1.Show("Enter full infomation", Retype, Retype.Location, 5000);
                 }
                 else if (nv.them(n))
                 {
                     if (nv.themUser(n))
                     {
                         MessageBox.Show("Done");
                         this.Close();
                     }
                 }
             }
             else
             {
                 toolTip1.ToolTipTitle = "Warning";
                 toolTip1.Show("Retype password again!", Retype, new Point(400, 250), 5000);
                 Retype.SelectAll();
                 Retype.Focus();
             }
         }
     }
     catch
     {
         MessageBox.Show("Failed", "Oops", MessageBoxButtons.OK);
     }
 }
 private void Edit()
 {
     if (Fullname.Enabled == false)
     {
         foreach (Control control in layoutControl1.Controls)
         {
             if ((control is TextEdit || control is DateTimePicker) && control != Username)
             {
                 control.Enabled = true;
             }
         }
     }
     else
     {
         nv.maNV     = Username.Text;
         nv.hoTen    = Fullname.Text;
         nv.ngaySinh = Birthday.Value.ToString();
         nv.sdt      = PhoneNumber.Text;
         nv.passWord = Password.Text;
         if (nv.isNull())
         {
             toolTip1.ToolTipTitle = "Warning";
             toolTip1.Show("Please enter full information", windowsUIButtonPanel1, windowsUIButtonPanel1.Location, 5000);
         }
         else
         {
             if (nhanVien.sua(nv))
             {
                 MessageBox.Show("Update successful", "Infomation");
                 Profile_Load(this, new EventArgs());
             }
             else
             {
                 MessageBox.Show("Update unsuccesful", "Warning");
                 return;
             }
         }
     }
 }