why we use static method with ref SqlConnection objConn in c#

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Pls some one tell that why we use ref in method parameter
code is

C#

private static void closeConnection(ref SqlConnection objCon)
        {
            try
            {
                if (objCon.State == ConnectionState.Open)
                {
             //objCon.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectDB"].ToString();
             objCon.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }

i want to know why we take ref Sqlconnection objcon in method
pls some one tell.....

Posted 24-Sep-12 21:14pm

chander_rani

Updated 24-Sep-12 21:18pm

D-Kishore

v3

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Martijn Kok · Answer 1 · 2012-09-24T21:54:00

Without the ref keyword the method will still function the same. Only when the objCon will reference another SqlConnection instance the use of ref keyword will be needed.

If you would like to Dispose the objCon and set it to null, then you would need the ref keyword. In that case in the calling method the instance of object would also be null. (But I guess then your method should be called closeAndDisposeConnection).

Shambhoo kumar · Answer 2 · 2012-09-24T21:18:00

Solution 1

i think in concurrent thread if afraid if the values passed to function calls may overlap for simultaneous calls.

Regard
Sham

Posted 24-Sep-12 21:18pm

Shambhoo kumar

Rajesh Anuhya · Answer 3 · 2012-09-24T22:16:00

Solution 3

Your Answer is here

http://stackoverflow.com/questions/635915/when-to-use-ref-and-when-it-is-not-necessary-in-c-sharp[^]

Thanks
--RA

Posted 24-Sep-12 22:16pm

Rajesh Anuhya