trying to create an array of colors

[davidrobin]

I need to create an array of colours. I have this code but it gives me an error:

An unhandled exception of type 'System.NullReferenceException' occurred in AceMosaic.exe

Additional information: Object reference not set to an instance of an object.

Dim colours() As Color
        Dim c As Control
        Dim intCount As Integer = -1
        For Each c In gpbColours.Controls
            If TypeOf c Is Label Then
                If c.Name.Substring(0, c.Name.IndexOf("_")).ToLower = "lblcolour" And c.Text = "X" Then
                    intCount += 1
                    colours(intCount) = c.BackColor
                End If
            End If
        Next

Can anyone tell me what I am doing wrong.