So i'm going to guess you want to find out if a certain string exists in an array. I'm not sure about that function but i know it can be done by looping through the array
E.g.
Boolean arrExists = new Boolean
arrExists = False
String var = <whatever string your looking for>
For i = 0 To <arrayname>.Count - 1 'Must use -1 because array index starts at 0
If <arrayname>(i).tostring() = var Then
arrExists = True
End If
Next
If arrExists = True Then
'Code for value exists in array
End If
If Array.IndexOf(arrOptions, "Name") > 0 Then
' Name is found
End If