The following code is executed intensively:

            ' Check for the last occurence
            If Mid(lcString, lcString.Length - lcWord.Length) = "." + lcWord Then
                lcString = Mid(lcString, 1, lcString.Length - lcWord.Length) + "[" + lcWord + "] "
            End If

            ' Check for the first occurence
            If Mid(lcString, 1, lcWord.Length + 1) = lcWord + "." Then
                lcString = "[" + Mid(lcString, 1, lcWord.Length) + "]" + Mid(lcString, lcWord.Length + 1)
            End If

Now, in order to fit some very long string, I have adjusted that method to use a StringBuilder instead.

So, just before that code, instead of lcString, I have a loStringBuilder. This is the last part remaining in the conversion of that method. I am looking for the best way to convert that.