Programming with AutoCAD 2015 and VS 2012

[avinash patil]

Hello,

I have created using AutoCAD 2015 with VS 2012 programs it gets error in

TxtObj.StyleName = "ROMANS"  ' sometime give error 
TxtObj.Rotation = North           ' sometime give error 
TxtObj = NewDrawing1.ModelSpace.AddText(Txt6, Pt11, TxtHt)  ' sometime give error 
TxtObj.Rotate(Pt11, North) ' sometime give error 
Dim ColorCyan As AcadAcCmColor ' sometime give error

ERROR WAS

"COMException was unhandled"

Above mentioned error give sometimes not every time one type of error. it gives sometime error in line1, next time line3, and so on.

earlier I have creacted with AutoCAD 2014 with VS 2010 it works good without interruption.

Is there revise any commands in newer version.

Can any one give any solution. Please help me.

Thanks in Advance,

Avinash