Question

I have this project that let user inputs 5 different numbers from 1 to 50. But I want to validate it before saving to DB that i will be 5 unique numbers. What’s the best and fastest way to do this?

Answer 1

Check this code

Private Function HasDuplicates(ByVal arr As Array) As Boolean
    For i As Integer = 0 To arr.Length - 1
        If Not arr(i) Is Nothing Then
            Dim l As Integer = Array.LastIndexOf(arr, arr(i))
            If l <> i Then Return True
        End If
    Next
    Return False
End Function