Problem with text handling.

I have to create a code that interacts with code. When I try to [Dim doconvert As New ConvertPostCode] it is saying that it is not defined. I have the following code for one of the private subs.

 [Dim NewText As String
    Dim doconvert As New [/ConvertPostCode]
    Private Sub capfirst()
        doconvert = New [/ConvertPostCode]
        NewText = doconvert.CapatalizeFirstLetter(txtText.Text)
        txtText.Text = NewText
    End Sub]