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Arrays to check duplicates in vb.net

RIAS asked
Last Modified: 2016-07-25

How to check if array has a string.Three checks on Uppercase,mixed case and lowercase.

 If IsDBNull(SQLdr(StrCol1)) = False Then
                    StrColval1 = SQLdr(StrCol1).ToString
                    StrColval1 = StrColval1.Trim
                    If StrColval1 <> String.Empty Then
                        If Not (Arr1.Contains(StrColval1)) Then
                            If Not Arr1.Contains(StrColval1.ToLower) Then
                            End If
                        End If
                        End If
                End If

Any better way of doing this?
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