Create and Edit AutoCAD Entities > Use Layers, Colors, and Linetypes > Work with Linetypes > Make a Linetype Active > 
Make a linetype current with the CELTYPE system variable
 
 
 

This example sets a linetype current with the CELTYPE system variable.

VB.NET 

Application.SetSystemVariable("CELTYPE", "Center")

C# 

Application.SetSystemVariable("CELTYPE", "Center");
VBA/ActiveX Code Reference
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