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i want to know what is the use of "using" keyword in c#, i am new to it.. when we need to use "using" keyword.. i googled it, could not be satisfied with answers. still i want to know some more from you Geeks..
Thanks
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The using keyword has two major uses: The using statement defines a scope at the end of which an object will be disposed. The using directive creates an alias for a namespace or imports types defined in other namespaces.
In C#, the using keyword has two purposes: The first is the using directive, which is used to import namespaces at the top of a code file. The second is the using statement. C# 8 using statements ensure that classes that implement the IDisposable interface call their dispose method.
Generally, we use the using keyword to add namespaces in code-behind and class files. Then it makes all the classes, interfaces and abstract classes and their methods and properties available in the current page.
The operator keyword declares a function specifying what operator-symbol means when applied to instances of a class. This gives the operator more than one meaning, or "overloads" it. The compiler distinguishes between the different meanings of an operator by examining the types of its operands.
Two uses:
Using directives, e.g.
using System;
using System.IO;
using WinForms = global::System.Windows.Forms;
using WinButton = WinForms::Button;
These are used to import namespaces (or create aliases for namespaces or types). These go at the top of the file, before any declarations.
Using statements e.g.
using (Stream input = File.OpenRead(filename))
{
...
}
This can only be used with types that implement IDisposable, and is syntactic sugar for a try/finally block which calls Dispose in the finally block. This is used to simplify resource management.
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