Returning multiple tables from a stored procedure

Question

In my winform application I have the following scenario:

I want to get multiple tables on a single event. Returning all tables as dataset in sin

Answer 1

The normal way is to get all at once.

just construct your SELECT's and you will have a DataSet filled with all tables.

using (System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection(myConnString))
{
    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand())
    {
        cmd.CommandText = "myMultipleTablesSP";
        cmd.Connection = conn;
        cmd.CommandType = CommandType.StoredProcedure;

        conn.Open();

        System.Data.SqlClient.SqlDataAdapter adapter = new System.Data.SqlClient.SqlDataAdapter(cmd);

        DataSet ds = new DataSet();
        adapter.Fill(ds);

        conn.Close();
    }
}

if for example you return 2 tables in your SP, like:

SELECT * FROM [TableA];
SELECT * FROM [TableB];

you would access this tables as:

DataTable tableA = ds.Tables[0];
DataTable tableB = ds.Tables[1];

Answer 2

If you load each table separately and use threads you can greatly improve the performance.

Datasets are also very heavy weight... so try avoiding them if possible.