This sample contains a texmap  plugin that outputs a plain color based on a parameter. It is a starting point to creating texmap plugins using Max.NET.

Download "Texmap" Plugin Sample

You need to make sure that Autodesk.Max.dll assembly is properly referenced for your version of 3dsmax, by default the project references the assembly in "C:\Program Files\Autodesk\3dsmax2011\Autodesk.Max.dll" but you can change this to any path.

After compiling simply copy the generated .dll file into 3dsmax plugins directory.