/// <summary>
/// Save employee with id <see cref="identifier"/>
/// </summary>
/// <param name="sender">Button</param>
/// <param name="e"><see cref="EventArgs"/></param>
private void SaveButton_Click(object sender, EventArgs e)
{
/*
* Simple assertion to ensure both first and last name have values
*/
if (Controls.OfType <TextBox>().Any(textbox => string.IsNullOrWhiteSpace(textbox.Text)))
{
MessageBox.Show("First and last name are reqired");
ResetEmployee();
return;
}
/*
* Create a new instance of an Employee and set the primary key so Entity Framework
* knows which record to update first and last name
*/
Employee employee = new ()
{
EmployeeId = identifier,
FirstName = FirstNameTextBox.Text,
LastName = LastNameTextBox.Text
};
try
{
var success = NorthWindOperations.SaveEmployee(employee);
MessageBox.Show(success ? "Saved" : "Failed");
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}
/// <summary>
/// Reset Employee from database current first and last names
/// </summary>
private void ResetEmployee()
{
Employee originalEmployee = NorthWindOperations.OriginalEmployee(identifier);
if (string.IsNullOrWhiteSpace(FirstNameTextBox.Text))
{
FirstNameTextBox.Text = originalEmployee.FirstName;
}
if (string.IsNullOrWhiteSpace(LastNameTextBox.Text))
{
LastNameTextBox.Text = originalEmployee.LastName;
}
}
/// <summary>
/// When this form is displayed get employee with an id of <see cref="identifier"/>
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private async void OnShown(object sender, EventArgs e)
{
await Task.Delay(500);
try
{
var employee = await NorthWindOperations.ReadEmployee(identifier);
FirstNameTextBox.Text = employee.FirstName;
LastNameTextBox.Text = employee.LastName;
FirstNameTextBox.SelectionStart = FirstNameTextBox.Text.Length;
FirstNameTextBox.SelectionLength = 0;
SaveButton.Enabled = true;
}
catch (Exception exception)
{
MessageBox.Show(exception.Message);
}
}