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 is the application event handlers in ASP.NET

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Application event handlers are located in global.asax file of the asp.net application
Below are the application event handlers in sequence of their execution -
  • Application_Start - Fired when the first user visits a page of the application or first resource is requested from the server. A web application starts, when a browser requests a page of the application for the first time. The request will be received by the IIS which then starts ASP.NET worker process. The worker process then allocates a process space to the assembly and loads it.
  • Application_End - Fired when there are no more users of the application.
  • Application_BeginRequest - Fired at the beginning of each request to the server.
  • Application_EndRequest - Fired at the end of each request to the server.
  • Session_Start - Fired when any new user visits.
  • Session_End - Fired when the users stop requesting pages and their session times out.

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