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What keyword returns true if a cast will succeed?

Posted By :Narayanan     Posted Date :July 26, 2012    Points :40   Category :.NET Framework 

You can also find related Interview Question to What keyword returns true if a cast will succeed?  below: 

Is it true that COM objects no longer need to be registered on the server?

Yes and No. Legacy COM objects still need to be registered on the server before they can be used. COM developed using the new .NET Framework will not need to be registered. Developers will be able to auto-register these objects just by placing them in the 'bin' folder of the application. (More...)

Yield keyword in C Sharp

C Sharp and yield keyword


One of the cool and yet most unknown feature of the C# is the yield keyword. The yield keyword is used in an iterator block to provide a value to the enumerator object or to signal the end of the iteration. When used the expression is evaluated and returned as a value to the enumerator object. Note the expression has to be implicitebly convertible to yield type of the iterator. Here is an example

public static IEnumerable GetIntCollectionFromString(string SomeString){ string[] val = SomeString.Split(' '); int intToAdd; foreach (string token in val) { if (int.TryParse(token, out intVal)) { yield return intVal; } else { yield break; } }}

Here since we are using the yield keyword the function will return the collection of intVal instead of the value of intVal. The statement will only return when the iteration of the loop is complete.

There are some limitation with the yield keywords.

Unsafe blocks are not allowed
Parameters to the method, operator, or accessor cannot be ref or out. (More...)

Web services can only be written in .NET, true or false?


WebService can be written in Java,DotNet and some other languages. (More...)

DateTime variables can be null (True / False )


The DateTime type is a non-nullable value type, and just like an integer, it cannot be assigned to null. (More...)

More than one IDENTITY column per table can be exist in SQL Server . (True /False)

There can only be one IDENTITY column per table in SQL Server.
Its auto Incremented Column defined by the user. (More...)

What is the use of param keyword in C#?

In C# param parameter allows us to create a method that may be sent to a set of identically typed arguments as a single logical parameter. (More...)

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