What's the meaning of public MyException(string str):base (str)

That is your class constructor. Basically this is what is called when you initialize the class using the new statement, for example: MyException ex = new MyException("Something"); The "base:(str)" is a directive that forwards the call to the constructor of the base class. Here is a short example: public class BaseClass { public BaseClass() { Console.WriteLine("BaseClass Initialized"); } } public class DerivedClass : BaseClass { pubic DerivedClass() : base() { Console.WriteLine("DerivedClass Initialized"); } } Now if you create an instance of the derived class from a console application. DerivedClass x = new DerivedClass(); The console output would be: BaseClass Initialized DerivedClass Initialized Try looking for info on the web about .Net and OO concepts (http://www.developer.com/net/csharp/article.php/1465681). Hope this helps, Dominique LeBlond

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denkai22y ago
That is your class constructor. Basically this is what is called when you initialize the class using the new statement, for example: MyException ex = new MyException("Something"); The "base:(str)" is a directive that forwards the call to the constructor of the base class. Here is a short example: public class BaseClass { public BaseClass() { Console.WriteLine("BaseClass Initialized"); } } public class DerivedClass : BaseClass { pubic DerivedClass() : base() { Console.WriteLine("DerivedClass Initialized"); } } Now if you create an instance of the derived class from a console application. DerivedClass x = new DerivedClass(); The console output would be: BaseClass Initialized DerivedClass Initialized Try looking for info on the web about .Net and OO concepts (http://www.developer.com/net/csharp/article.php/1465681). Hope this helps, Dominique LeBlond
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