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Use AndAlso and OrElse instead of just AND or OR. When performing an If statement in VB.NET, VB actually evaluates both expressions to see if the who expression is true. Even when the first expression is false, it continues to look at the second argument even though it doesn't have to. This is very helpful when using Functions as expressions in the statement.
Instead of doing this
If(Function1() And Function2()) Then
Do this
If(Function1() AndAlso Function2()) Then
The 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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