// Precondition: Attempting to change focus from patron_ComboBox_Validating
// Postcondition: If patronBoxCbo.selectedIndex >= 0, focus will change,
// else error message will be set
private void patron_ComboBox_Validating(object sender, CancelEventArgs e)
{
if (patron_ComboBox.SelectedIndex < 0)
{
e.Cancel = true; // Stops focus changing
}
CheckOutError.SetError(patron_ComboBox, "Must select an patron!"); // Set error message
patron_ComboBox.SelectAll();
}
// Precondition: Attempting to change focus from returnItemCbo_Validating
// Postcondition: If patronBoxCbo.selectedIndex >= 0, focus will change,
// else error message will be set
private void patronBoxCbo_Validating(object sender, CancelEventArgs e)
{
if (patronBoxCbo.SelectedIndex < 0)
{
e.Cancel = true; // Stops focus changing process
}
// Will NOT proceed to Validated event
CheckOutError.SetError(patronBoxCbo, "Must select an patron!"); // Set error message
patronBoxCbo.SelectAll();
}
// Precondition: itemsAvaCbo_Validating Succeeded
// Postcondition: ErrorMessage has been cleared, and the user can shift focus and continue on their way
private void patronBoxCbo_Validated(object sender, EventArgs e)
{
CheckOutError.SetError(patronBoxCbo, ""); // Clears error message
}
// Precondition: itemsAvaCbo_Validating Succeeded
// Postcondition: ErrorMessage has been cleared, and the user can shift focus and continue on their way
private void itemsAvaCbo_Validated(object sender, EventArgs e)
{
CheckOutError.SetError(itemsAvaCbo, ""); // Clears error message
}
// Precondition: item_ComboBox_Validated Succeeded
// Postcondition: ErrorMessage has been cleared, and the user can shift focus and continue on their way
private void item_ComboBox_Validated(object sender, EventArgs e)
{
CheckOutError.SetError(item_ComboBox, ""); // Clears error message
}