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From: chaitanyadbt
Message 2 in Discussion
Please send me some links related to ComponentArt1.1
Thanks and Regards
Chaitanya Vemulapalli
From: BDotNet@groups.msn.com
To: BDotNet@groups.msn.com
Subject: Dating Dotnet - The advantage of using Using in .Net
Date: Tue, 23 Oct 2007 02:33:14 -0700
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New Message on BDOTNET
Dating Dotnet - The advantage of using Using in .Net
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Message 1 in Discussion
From: VBGURU
source:
http://www.aravinda.in/Tech.aspx?Title=The_Advantage_of_Using_Using&WebPage=tech\dotnet\TheAdvantageofUsingUsing.htm
@ www.aravinda.in
Usage 1
using Directive
The using directive has two uses:
Create an alias for a namespace (a using alias).
Permit the use of types in a namespace, such that, you do not have to
qualify the use of a type in that namespace (a using directive).
Create a using alias to make it easier to qualify an identifier to a namespace
or class.
Create a using directive to use the types in a namespace without having to
specify the namespace. A using directive does not give you access to any
namespaces that may be nested in the namespace you specify.
Namespaces come in two categories: user-defined and system-defined.
User-defined namespaces are namespaces defined in your code. See the
documentation for the .NET Framework for a list of the system-defined namespaces
The following sample shows how to define a using directive and a using alias
for a class:
// cs_using_directive2.cs
using System; // using directive
using AliasToMyClass = NameSpace1.MyClass; // using alias for a class
namespace NameSpace1
{
public class MyClass
{
public override string ToString()
{
return "You are in NameSpace1.MyClass";
}
}
}
namespace NameSpace2
{
class MyClass
{
}
}
namespace NameSpace3
{
using NameSpace1; // using directive
using NameSpace2; // using directive
class Test
{
public static void Main()
{
AliasToMyClass somevar = new AliasToMyClass();
Console.WriteLine(somevar);
}
}
}
Output
You are in NameSpace1.MyClass
Usage 2
The other most important usage of using Using is
using Statement (C# Reference)
Defines a scope, outside of which an object or objects will be disposed.
Syntax
using (Font font1 = new Font("Arial", 10.0f))
{
}
C#, through the .NET Framework common language runtime (CLR), automatically
releases the memory used to store objects that are no longer required. The
release of memory is non-deterministic; memory is released whenever the CLR
decides to perform garbage collection. However, it is usually best to release
limited resources such as file handles and network connections as quickly as
possible.
The using statement allows the programmer to specify when objects that use
resources should release them. The object provided to the using statement must
implement the IDisposable interface. This interface provides the Dispose
method, which should release the object's resources.
A using statement can be exited either when the end of the using statement is
reached or if an exception is thrown and control leaves the statement block
before the end of the statement.
The object can be declared in the using statement, as shown above, or before
the using statement, like this:
The following sample shows how a user-defined class can implement its own
Dispose behavior. Note that your type must inherit from IDisposable.
using System;
class C : IDisposable
{
public void UseLimitedResource()
{
Console.WriteLine("Using limited resource...");
}
void IDisposable.Dispose()
{
Console.WriteLine("Disposing limited resource.");
}
}
class Program
{
static void Main()
{
using (C c = new C())
{
c.UseLimitedResource();
}
Console.WriteLine("Now outside using statement.");
Console.ReadLine();
}
}
source:
http://www.aravinda.in/Tech.aspx?Title=The_Advantage_of_Using_Using&WebPage=tech\dotnet\TheAdvantageofUsingUsing.htm
@ www.aravinda.in
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