This is the .NET interview questions which you come across many a times. So following is the answer to it with explanation.

Implement IDisposable interface and implement the dispose function.

This is not one of the typical .NET interview questions but on knowledge aspect it might be very helpful and also helpful while you dealing with GridView.

The checked keyword is used to explicitly enable overflow checking for integral-type arithmetic operations and conversions.

In arraylist or array if we have to access any data we need to use the internal index id generated by the array list collection. For instance the below code snippet shows how the internal id is used to fetch data from array list.

The const keyword is used to modify a declaration of a field or local variable. It specifies that the value of the field or the local variable cannot be modified.

In this mode the users are stored in windows local user groups.

WCF services can be hosted in multiple protocols like http, TCP etc. Web services can only be hosted on Http protocol.

Some methods in abstract classes can have implementation.

This object creates a connection to the database. If you want to do any operation on the database you have to first create a connection object.

The whole point about strong names is to ensure that the clients (UI, External components etc) who is consuming the DLL knows that the DLL was published from a valid source

This is one of the important and most asked.NET interview questions. Delegate is basically an abstract strong pointer to a function or method while events are higher level of encapsulation over delegates.

Windows API calls are not COM based and they are invoked through Platform Invoke Services.

Tracing: - Tracing is a way to monitor the execution of your ASP.NET application. You can record exception details and program flow in a way that doesn't affect the program's output.

A transaction is a sequence of operations performed as a single logical unit of work. A logical unit of work must exhibit four properties, called the ACID (Atomicity, Consistency, Isolation, and Durability) properties, to qualify as a transaction: