/// <summary>
/// Verifies that all the user input data is valid.
/// </summary>
/// <returns>A boolean indicating whether the
/// input data is valid or not.</returns>
private bool ValidateForm()
{
bool isValid = true;
//Lamda expression comparing the input to "" (null data).
//Returns true if they are equal.
Func <string, bool> compareString = s => s == "";
CheckIDIsValid();
//If the error message is null (i.e. there is no error message),
//isValid remains the same.
isValid = compareString(ErrorProvider.GetError(TextBoxStudentIDValue)) ? isValid : false;
ClassLibrary.CheckNameIsValid(TextBoxFirstNameValue, ErrorProvider);
isValid = compareString(ErrorProvider.GetError(TextBoxFirstNameValue)) ? isValid : false;
ClassLibrary.CheckNameIsValid(TextBoxLastNameValue, ErrorProvider);
isValid = compareString(ErrorProvider.GetError(TextBoxLastNameValue)) ? isValid : false;
return(isValid);
}
/// <summary>
/// Verifys that the user input data is valid.
/// </summary>
/// <returns>A boolean indicating whether the components
/// have validated correctly or not.</returns>
private bool ValidateForm()
{
bool isValid = true;
//Lamda expression that compares an input to null data.
//Returns true if the supplied input is null.
Func <string, bool> compareString = s => s == "";
ClassLibrary.CheckNameIsValid(TextBoxFirstNameValue, ErrorProvider);
//Alternative to writing IF statements to improve readability.
//isValid remains the same (in this case, TRUE) if the ErrorProvider
//has no error set, otherwise it is set to false
isValid = compareString(ErrorProvider.GetError(TextBoxFirstNameValue)) ? isValid : false;
ClassLibrary.CheckNameIsValid(TextBoxLastNameValue, ErrorProvider);
isValid = compareString(ErrorProvider.GetError(TextBoxLastNameValue)) ? isValid : false;
ClassLibrary.CheckEmailIsValid(TextBoxStaffEmailValue, ErrorProvider);
isValid = compareString(ErrorProvider.GetError(TextBoxStaffEmailValue)) ? isValid : false;
//Returns true if all components validate successfully
return(isValid);
}
private void TextBoxLastNameValue_Validating(object sender, CancelEventArgs e)
{
ClassLibrary.CheckNameIsValid(TextBoxLastNameValue, ErrorProvider);
}