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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What are AJAX Helpers in ASP.Net MVC?

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AJAX Helpers are used to create AJAX enabled elements like as Ajax enabled forms and links which
performs the request asynchronously and these are extension methods of AJAXHelper class which
exists in namespace - System.Web.ASP.Net MVC.

Below are the options in AJAX helpers :
Url : This is the request URL.

Confirm : This is used to specify the message which is to be displayed in confirm box.

OnBegin : Javascript method name to be given here and this will be called before the AJAX
request.

OnComplete : Javascript method name to be given here and this will be called at the end of
AJAX request.

OnSuccess - Javascript method name to be given here and this will be called when AJAX
request is successful.

OnFailure - Javascript method name to be given here and this will be called when AJAX
request is failed.

UpdateTargetId : Target element which is populated from the action returning HTML

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