Re: Getting the multiple element IDs for materials in a wall

Thanks for your reply. I have tried implementing your Get() method as follows: 

FilteredElementCollector wallTypes // 2014
              = new FilteredElementCollector(rvtDoc)
                .OfClass(typeof(WallType));

string s = "";

foreach (WallType wallType in wallTypes)
{
s += Get(wallType) + "\r\n";
}

TaskDialog.Show(
          "Revit Intro Lab",
          "Wall Types (in main instruction):\n\n" + s);

However when I print the result to dialog I get the following message: 

"Material_Select_2 + <Get>d__0" for each instance 

Material_Select_2 is the name of my class, I am guessing this has something to do with the variable it is stored in, do you have any idea how I can convert this to a string? 

Thanks