Difference between array, arraylist, List, Hashtable, Dictionary and SortedList in c#

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Basic difference is that arrays are of fixed size. Whereas an ArrayList implements the list data structure and can dynamically grow. While arrays would be more performance that a list, a list would be far more flexible since you don't need to know the required size initially. Array - represents an old-school memory array - kind of like a alias for a normal type[] array. Can enumerate. Can't grow automatically. I would assume very fast insertion, retrieve and speed. ArrayList - automatically growing array. Adds more overhead. Can enum., probably slower than a normal array but still pretty fast. These are used a lot in .NET List - one of my favorites - can be used with generics, so you can have a strongly typed array, e.g. List . Other than that, acts very much like ArrayList. Hashtable - plain old hashtable. O(1) to O(n) worst case. Can enumerate the value and keys properties, and do key/val pairs. Dictionary - same as above only strongly typed via generics, such a...
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Performance wise which is better, Session or ViewState?

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  • For large amount of data, Session will be an efficient way to go. When session is not used, set it to null for memory overhead but this cannot be done in all the cases. Once the session timeout happened it automatically set to null. Default timeout is 20 minutes.
  • In Viewstate, all data will be stored in HTML hidden fields. For large amount of data, it would give performance issues. Ideal size of viewstate should not be more than 20-30% of page size. So for less data viewstate will be an ideal solution.

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