Let’s say you have a list of objects and you want a random presentation to your website visitor. Below is a simple, but effective random algorithm in C# with Linq-to-object by using the GUID type (see line 10 below).
1: List<MemorySearchResult> list = Session["MemoryList"] as List<MemorySearchResult>;
2:
3: // see if list is already in user session
4: if (list == null)
5: { 6: // list not in session, so create a new one
7: var newList = myRepository.GetListOfObjects();
8:
9: // randommize
10: list = newList.OrderBy(tempGuid => Guid.NewGuid()).ToList();
11:
12: // store in session
13: Session["MemoryList"] = list;
14: }
15:
16: // now list is randomized and stored in session and ready to use
Easy does it!