How Do I Get The Index Value When The Index value Is An Array Of Integer.

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VB

I'm working on a vb.net version of the bifid cipher decoder/cracker.

I found some code that will create the 5x5 matrix out of the alphabet - the letter J.
That I converted from a C# version.

Private KeyMatrix As String(,) = New String(4, 4) {}

Private Sub BuildKeyMatrix()
    Dim k As Integer = 65
    For i As Integer = 0 To 4
        For j As Integer = 0 To 4 'index has to start at zero or errors out
            If k = 74 Then
                k += 1
            End If
            ' j’yi alma(j take) (j ascii = 64)
            KeyMatrix(i, j) = Chr(k).ToString()
            k += 1
        Next
    Next
End Sub

When viewed thru the debugger you see it is showing index / value pair as

0,0 A
0,1 B
0,2 C
0,3 D
0,4 E
1,0 F
1,1 G
1,2 H
and so on

If I do this I can get the letters.

For Each ltr In KeyMatrix
    strbldr.AppendLine(ltr)
Next

But how do I get the Index array back by letter value ?
A standard Index(of ) does not work for indexs of array.

I may just use two Zero based indexes or list(of type) one of Char and another of the Integer array.