Translate an Excel column number to its equivalent column letter using Visual Basic .NET

Private Function GetColumnLetter(ByVal columnNumber As Integer) As String
    Dim columnLetter As String
    If columnNumber <= 25 Then
        columnLetter = Chr(65 + columnNumber)
    Else
        columnLetter = GetColumnLetter(columnNumber \ 26 - 1)
        columnLetter &= Chr(65 + columnNumber Mod 26)
    End If
    Return columnLetter
End Function