https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538467#M69415 I'm starting the transition from VBA to VB .Net, so this is probably incredibly easy. I haven't even started writing my own code yet, just pasting snippets to get a feel for everything. I've put in a sub routine to draw a single line in model space of AutoCAD. Works great. The problem occurs when I create a form and try to call the sub routine from a button. Then I get an "eLockViolation" when I try to open the model space "for write". I'm guessing that it is because AutoCAD is no longer active because this form is active? If that makes any sense? But, even if I hide the form before I call the sub routine, I still get the error. <BR /> <BR /> Any suggestions would be appreciated.<BR /> <BR /> Thanks<BR /> <BR /> Dave<BR /> <BR /> See attachment for the code. Tue, 11 Aug 2009 18:52:19 GMT david_sexton 2009-08-11T18:52:19Z https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538467#M69415 I'm starting the transition from VBA to VB .Net, so this is probably incredibly easy. I haven't even started writing my own code yet, just pasting snippets to get a feel for everything. I've put in a sub routine to draw a single line in model space of AutoCAD. Works great. The problem occurs when I create a form and try to call the sub routine from a button. Then I get an "eLockViolation" when I try to open the model space "for write". I'm guessing that it is because AutoCAD is no longer active because this form is active? If that makes any sense? But, even if I hide the form before I call the sub routine, I still get the error. <BR /> <BR /> Any suggestions would be appreciated.<BR /> <BR /> Thanks<BR /> <BR /> Dave<BR /> <BR /> See attachment for the code. Tue, 11 Aug 2009 18:52:19 GMT https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538467#M69415 david_sexton 2009-08-11T18:52:19Z https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538468#M69416 Dim myDWG As Document = ApplicationServices.Application.DocumentManager.MdiActiveDocument<BR /> <BR /> Using lock As DocumentLock = myDWG.LockDocument<BR /> ' do stuff<BR /> End Using Tue, 11 Aug 2009 19:58:14 GMT https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538468#M69416 arcticad 2009-08-11T19:58:14Z https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538469#M69417 That did it!! Thanks! Tue, 11 Aug 2009 20:17:43 GMT https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538469#M69417 david_sexton 2009-08-11T20:17:43Z https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538470#M69418 Your Welcome Tue, 11 Aug 2009 22:45:39 GMT https://forums.autodesk.com/t5/net-forum/newbie-question/m-p/2538470#M69418 arcticad 2009-08-11T22:45:39Z