AutoCAD .NET :: Finding A Sphere In Database

As part of the automation requirements we are working on (through the .NET interface), we would like to find out whether a given drawing contains a sphere and if it does we would like to know its properties. We are doing something like this, to loop through the database and am able to get all Solid3d type of objects.

What I would like to know, if a given solid3d object is a sphere or otherwise. The code snippet is pasted here for reference:

bool bContainsSphere = false;            
foreach (ObjectId Id in Ids)
{
  DBObject oObject = ts.GetObject(Id, OpenMode.ForRead);                  
  if (oObject.GetType().Name == "Solid3d")
 
[Code] ......