The is keyword lets you check if a variable is pointing to an object of a particular class (or a class that inherits from some class). For example, the code in this if block only executes if ...

to existing types in C#. For example, the code snippet below illustrates how you can extend the string class in C# to add a new method that returns the count of non-space characters in the string.

You should not use an interface if you need to write the same code for ... for example, include behavior from multiple sources in a class. That capability is important in C# because the language ...

If all you want to do is try something out with some throwaway code, C# Scripting in Visual Studio might be a ... will work together to build a Customer class, for example (the CSI environment detects ...