One novel feature of C# is that it is also possible to write a static no - parameter constructor for a class.Such a constructor will be executed only once, as opposed to the constructors written so far, which are instance constructors that are executed whenever an object of that class is created.
class MyClass
{
static MyClass()
{
// initialization code
}
// rest of class definition
}
One reason for writing a static constructor is if your class has some static fields or properties that need to be initialized from an external source before the class is first used.
The .NET runtime makes no guarantees about when a static constructor will be executed, so you should not place any code in it that relies on it being executed at a particular time (for example, when an assembly is loaded). Nor is it possible to predict in what order static constructors of different classes will execute. However, what is guaranteed is that the static constructor will run at most once, and that it will be invoked before your code makes any reference to the class. In C#, the static constructor usually seems to be executed immediately before the first call to any member of the class.