//Create the material
ElementId materialId = Material.Create(familyDoc, "My Material" + m);
// adding random m to avoid same names used when running the program multiple times.
material = familyDoc.get_Element(materialId) as Material;
ElementId materialId2 = Material.Create(familyDoc, "My Material_2" + m); // adding random m to avoid same names used when running the program multiple times.

material2 = familyDoc.get_Element(materialId2) as Material;