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 ASP.NET 2.0  |  Question 48 of 161    Print  
What is difference between OR and ORElse?

  
Total Answers and Comments: 1 Last Update: March 09, 2006   
  
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March 09, 2006 05:42:35   #1  
praveen_kunwar Member Since: March 2006   Contribution: 8    
RE: What is difference between OR and ORElse?

ORELSE - Either of the two expressions is true. If the first expression is True the second is not evaluated. - ex. are from http://msdn.microsoft.com/library/default.asp?url /library/en-us/vblr7/html/valrfOrElseOperator.asp

Dim A As Integer 10
Dim B As Integer 8
Dim C As Integer 6
Dim myCheck As Boolean
myCheck A > B OrElse B > C ' True. Second expression is not evaluated.
myCheck B > A OrElse B > C ' True. Second expression is evaluated.
myCheck B > A OrElse C > B ' False.

If MyFunction(5) True OrElse MyOtherFunction(4) True Then
' If MyFunction(5) is True MyOtherFunction(4) is not called.
' Insert code to be executed.
End If

ANDALSO - 

Instead of doing thisIf(Function1() And Function2()) ThenDo thisIf(Function1() AndAlso Function2()) ThenThe first code will evaluate the result of Function2() even if Function1() returned false.The second will only evaluate Function2() if Function1() returned true.

 
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