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C#.NET INTERVIEW QUESTION & ANSWERS

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31. What is the syntax to declare a namespace in .NET?
  In C#, the namespace keyword is used to declare a namespace in the code. The syntax for declaring a namespace in C# is: namespace MyNamespace
  Posted by Aswini Aluri. (Nov 20, 2013)
 

system.data.datatable
dt=new datatable();
like this you have to declare namespace in c#.net
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32. How many languages .NET is supporting now?
  When .Net was introduced it came with some 16 languages. VB.NET, C#, COBOL and PERL etc. Now .NET Framework 4.0 supports 96+ languages.
  Posted by Prathap Naidu. (Apr 22, 2013)
 

When .Net was introduced it came with some 56 languages. VB.NET, C#, COBOL and PERL etc
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33. What is the difference between the Debug class and Trace class?
  Use Debug class for debug builds. Use Trace class for both debug and release builds.
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34. What is the difference between Array and Arraylist?
  An array is a collection of the same type. The size of the array is fixed in its declaration. A linked list is similar to an array but it doesn't have a limited size.
  Posted by Sindhu. (May 02, 2014)
 

An array is a collection of the same type where as an arraylist is a collection of different types. An array is fixed in its declaration where as an arraylist can either be increased or decreased dynamically
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35. What are methods?
  A method represents a behavior of a class.
Methods are the building blocks of a class, in which they are linked together to share and process data to produce the result.
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