What are the situations we can use "USING" keyword in C#

Posted by Sivakumar.S under C# on 6/5/2012 | Points: 10 | Views : 2170 | Status : [Member] | Replies : 5

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Hi all,

What are the situations we can use "USING" keyword in C#. As per my knowledge we are using to import namespace. Is any other usage for "USING" keyword in C# ?. And also please clear what are the situations we should use "IS" AND "AS" keyword in C#. can anyone explain with detail explanation and its usage?

siva

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Posted by: Kavi.Sirius on: 6/5/2012 [Member] Starter | Points: 25

0	hi Refer this link http://www.mindfiresolutions.com/Two-ways-to-use-using-keyword-in-C-1160.php Regards Kavi.n Sivakumar.S, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Ajay.Kalol on: 6/5/2012 [Member] Starter | Points: 25

0	Here is Sample Code for Understanding Use of " Using " using(SqlConnection con= new SqlConnection(connectionString) ) { SqlCommand cmd = new SqlCommand(commandString, sqlconnection); con.Open(); using (SqlDataReader reader = cmd.ExecuteReader()) { while (reader.Read()) { //DO } } } "Using" keyword takes the parameter of type IDisposable. Whenever you are using any IDisposable type object you should use the "using" keyword to handle automatically when it should close or dispose. Internally using keyword calls the Dispose() method to dispose the IDisposable object. Object is disposed automatically on the end of this statement. For is and as operator it is use for check casting and return Boolean value. check for more details http://ekrishnakumar.wordpress.com/2006/07/08/c-is-and-as-operators/ Ajay ajaypatelfromsanthal.blogspot.in Sivakumar.S, if this helps please login to Mark As Answer. \| Alert Moderator

Here is Sample Code for Understanding Use of " Using "


using(SqlConnection con= new SqlConnection(connectionString) )

            {

              SqlCommand cmd = new SqlCommand(commandString, sqlconnection);

             con.Open();

             using (SqlDataReader reader = cmd.ExecuteReader())

             {

                while (reader.Read())

                {

                  //DO

                }

             }

           }

"Using" keyword takes the parameter of type IDisposable.
Whenever you are using any IDisposable type object you should use the "using" keyword to handle automatically when it should close or dispose.
Internally using keyword calls the Dispose() method to dispose the IDisposable object.
Object is disposed automatically on the end of this statement.

For is and as operator
it is use for check casting and return Boolean value.
check for more details
http://ekrishnakumar.wordpress.com/2006/07/08/c-is-and-as-operators/

Ajay
ajaypatelfromsanthal.blogspot.in

Sivakumar.S, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: Sivakumar.S on: 6/5/2012 [Member] Starter | Points: 25

0	Hi all, Thanks for your explanations. siva Sivakumar.S, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: perfectchourasia-9163 on: 6/7/2012 [Member] Starter | Points: 25

0	"Using" keyword takes the parameter of type IDisposable. After using it dispose the connection by default 25 connection are allowed in Dot.net ER sandeep chourasia sandeepchrs@yahoo.com (on facebook) http://www.aspnetcodes.com/ Sivakumar.S, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Muhsinathk on: 6/11/2012 [Member] Bronze | Points: 25

0	http://www.mindfiresolutions.com/Two-ways-to-use-using-keyword-in-C-1160.php http://www.authorcode.com/use-of-using-directive-in-c/ Sivakumar.S, if this helps please login to Mark As Answer. \| Alert Moderator

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