Difference between using keyword when used in using directive section and when used with in a class to call the dispose method on the object ?

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We use the same key i.e 'using' for including the name space and also to call the Dispose method on the object like...

using System.Object;
and
using (SqlConnection conn = new SqlConnection(connString))
{
...
}

My question is how the compiler will know for what purpose the keyword 'using' is used ?

What I have tried:

I do not have idea how to try this to know how the compiler will do this.

Posted 17-May-16 23:36pm

Manzoor Ahmed P

Updated 18-May-16 1:06am

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Kornfeld Eliyahu Peter 18-May-16 5:40am

Context and syntax...
(Hint: RTFM)

2 solutions

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F-ES Sitecore · Answer 1 · 2016-05-18T01:06:00

Solution 2

It does it by context. If the keyword is outside of a class\method it assumes you are doing the namespace version, if the keyword is inside a class it assumes it is the object dispose version.

Posted 18-May-16 1:06am

F-ES Sitecore

Zafar Sultan · Answer 2 · 2016-05-18T00:01:00

1. As a directive(shortcut for namespaces):

C#

System.Data.SqlClient.SqlConnection myCon = new System.Data.SqlClient.SqlConnection(connectionString);

To simplify the above statement just write:

C#

using System.Data.SqlClient;

before any declaration(on very top of the class) and then you may write the simplified statement as:

C#

SqlConnection myCon = new SqlConnection(connectionString);

This way you have included the namespace required for "SqlConnection" class so that you don't have to include the complete namespace whenever you create the object of "SqlConnection" class.

2. As a statement(to dispose any object references implementing the IDisposable interface)

C#

using(SqlConnection myCon = new SqlConnection(connectionString)){
//do the work
}

It is used to release resources automatically but can only be used with types that implement IDisposable.