Test Your .NET 3.5 Apps: C#: Check the Business Rule Logic: Listing 2

The protected overload method named ValidateData performs the normal business rule checking after the public overload ValidateData checks the data for correct data types. The protected ValidateData method uses the private variables that have been set with good data from the public ValidateData method. If errors are encountered in either method, then an appropriate error message is generated and appended to a string variable that can be reported back through a public variable on this class.

// C#

public const string SELECT_TEXT = "[Select]";
private string mstrMsg = string.Empty;

public bool ValidateData(
  string Resource, string EntryDate, 
  string Customer, string Hours, 
  string Description)
  decimal value = 0;

  mstrMsg = string.Empty;

  if (Resource != SELECT_TEXT) {
    mstrResource = Resource;
  if (IsDate(EntryDate)) {
    mdtEntryDate = 
  if (Customer != SELECT_TEXT) {
    mstrCustomer = Customer;
  //  Make sure hours entered are decimal values
  if (decimal.TryParse(Hours, out value) == false) {
    mstrMsg += "Hours must be in decimal format." +
  else {
    mdecHours = value;
  mstrDescription = Description;

  return ValidateData();


Public Const SELECT_TEXT As String = "[Select]"
Private mstrMsg As String = String.Empty

Public Function ValidateData(ByVal Resource _
  As String, ByVal EntryDate As String, ByVal _
  Customer As String, ByVal Hours As String, _
  ByVal Description As String) As Boolean

  Dim value As Decimal

  mstrMsg = String.Empty

  If Resource <> SELECT_TEXT Then
    mstrResource = Resource
  End If
  If IsDate(EntryDate) Then
    mdtEntryDate = Convert.ToDateTime(EntryDate)
  End If
  If Customer <> SELECT_TEXT Then
    mstrCustomer = Customer
  End If
  ' Make sure hours entered are decimal values
  If Decimal.TryParse(Hours, value) = False Then
    mstrMsg &= "Hours must be in decimal format." _
      & Environment.NewLine
    mdecHours = value
  End If
  mstrDescription = Description

  Return ValidateData()
End Function
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