1int i = 0;
 2// iterate through each Entity and check its type
 3foreach (AlignmentEntity myAe in align.Entities)
 4{
 5    i++;
 6    String msg = "";
 7
 8    switch (myAe.EntityType)
 9    {
10        case AlignmentEntityType.Arc:
11            AlignmentArc myArc = myAe as AlignmentArc;
12            msg = String.Format("Entity{0} is an Arc, length: {1}\n", i, myArc.Length);
13            break;
14
15        case AlignmentEntityType.Spiral:
16            AlignmentSpiral mySpiral = myAe as AlignmentSpiral;
17            msg = String.Format("Entity{0} is a Spiral, length: {1}\n", i, mySpiral.Length);
18            break;
19        // we could detect other entity types as well, such as 
20        // Tangent, SpiralCurve, SpiralSpiral, etc.
21        default:
22            msg = String.Format("Entity{0} is not a spiral or arc.\n", i);
23            break;
24
25    }
26    // write out the Entity information
27    ed.WriteMessage(msg);
28}