How To with pthfinder algrtm definedxf fileslayers

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C#

AutoCAD

Hi everyone I am using C# (visual studio 2010 .netframework 4) and i need to make an application in which the user can import .dwg files and edit some of the attributes such as access the layer and view drawings on windowsform(form1).

Example:

if(drawing layer == "layer1")
   messagebox.show("Current layer is layer1")
else
   this.close();

and how to after adding the project and connect with A* algorithm?
A* algorithm implementation in C#[^]

example:

dwg layer1=wall (identified as a barrier to)
dwg layer2=road (identified as a road to)

How do I define the layers to the project?