C# using statement catch error

Question

I am just looking at the using statement, I have always known what it does but until now not tried using it, I have come up with the below code:

 using (SqlComma         


        

Answer 1

This code should be as follows to ensure timely closing of the connection. Closing just the command doesn't close the connection:

using (SqlConnection con = new SqlConnection(Settings.Default.qlsdat_extensionsConnectionString))
using (SqlCommand cmd = new SqlCommand(reportDataSource, con))
         {
             cmd.CommandType = CommandType.StoredProcedure;
             cmd.Parameters.Add("@Year", SqlDbType.Char, 4).Value = year;
             cmd.Parameters.Add("@startDate", SqlDbType.DateTime).Value = start;
             cmd.Parameters.Add("@endDate", SqlDbType.DateTime).Value = end;
             cmd.Connection.Open();

             DataSet dset = new DataSet();
             new SqlDataAdapter(cmd).Fill(dset);
             this.gridDataSource.DataSource = dset.Tables[0];
         }

To answer your question, you can do the same in a finally block, but this scopes the code nicely and ensures that you remember to clean up.