Generic Collections vs Non-Generic Collection

Question

Hi Dudes Can any one help me that what is difference b/w Generic Collections and Non-Generic Collection and alo

Vulpes · Answer

The basic difference is that generic collections are strongly typed and non-generic collections are not unless they've been specially written to accept just a single type of data. In the .NET Framework the non-generic collections (ArrayList Hashtable SortedKist Queue etc.) store elements internally in 'object' arrays which can of course store any type of data. This means that in the case of value types (int double bool char etc) they have to be 'boxed' first and then 'unboxed' when you retrieve them which is quite a slow operation. Whilst you don't have this problem with reference types you still have to cast them to their actual types before you can use them. In contrast generic collections (List  Dictionary  SortedList  Queue etc) store elements internally in arrays of their actual types and so no boxing or casting is ever required. This means that generic collections are faster than their non-generic counterparts when using value types and more convenient when using reference types. In short the latter are now virtually redundant.

Sandeep Shekhawat · Answer

http://www.c-sharpcorner.com/UploadFile/Ashush/GenericsInCSharp03232008084615AM/GenericsInCSharp.aspx