C # change the size of the borderless form

Const   Int Wm_nchittest =   Zero X 0084 ;
Const   Int Htleft =   10 ;
Const   Int Htright =   11 ;
Const   Int Httop =   12 ;
Const   Int Httopleft =   13 ;
Const   Int Httopright =   14 ;
Const   Int Htbottom =   15 ;
Const   Int Htbottomleft =   0x10 ;
Const   Int Htbottomright =   17 ;

Protected   Override   Void Wndproc ( Ref Message m)
{
Base . Wndproc ( Ref M );
Switch (M. msg)
{
Case Wm_nchittest:
Point vpoint =   New Point (( Int ) M. lparam &   0 xFFFF ,
( Int ) M. lparam >   16   &   0 xFFFF );
Vpoint = Pointtoclient (vpoint );
If (Vpoint. x <=   5 )
If (Vpoint. Y <=   5 )
M. Result = (Intptr) httopleft;
Else   If (Vpoint. Y > = Clientsize. Height -   5 )
M. Result = (Intptr) htbottomleft;
Else M. Result = (Intptr) htleft;
Else   If (Vpoint. x > = Clientsize. Width -   5 )
If (Vpoint. Y <=   5 )
M. Result = (Intptr) httopright;
Else   If (Vpoint. Y > = Clientsize. Height -   5 )
M. Result = (Intptr) htbottomright;
Else M. Result = (Intptr) htright;
Else   If (Vpoint. Y <=   5 )
M. Result = (Intptr) httop;
Else   If (Vpoint. Y > = Clientsize. Height -   5 )
M. Result = (Intptr) htbottom;
Break ;< BR >}< br>