It is common to have multiple expressions in an If statement using logical operators And, Or, etc. Remember that every expression in the If statement will always be evaluated, even if a previous expression renders the entire statement False. This could cause an unexpected error in certain situations.

'
' Even if x=0 the second expression will be evaluated
' raising a divide by 0 error.
'
If (x > 0) And (y / x > 1) Then
        ' Do something here
    End If

'
' Separate the expressions to avoid a divide by 0 error.
'
    If (x > 0) Then
        If (y / x > 1) Then
            ' Do something here
        End If
    End If