[dba-VB] VB.Net - cut and trim

I am looking at how to do in VB.Net what in VBA would be str =
trim(mid(str,intStartPos, intLen))
 
I can do this (I think) in two steps using:
 
    private mstr as string
    mstr = lstrRecord.SubString(intStartPos,intWidth)
    mstr = mstr.Trim(mstr.ToCharArray)
 
Given what I know about VB.Net (not very darned much) is this the best way?
I see where the string builder can do the substring part but it does not
have a trim method.
 
John W. Colby
Colby Consulting
www.ColbyConsulting.com