Open and close connection when there is a fill()

Below is the code used to get data from sql into visual studio:

 publicstaticDataTable GetData(string selectCommand,DataTable datatable)

        {

           datatable.Clear();

           SqlConnection conn = newSqlConnection("Connection string");

           SqlCommand comm = newSqlCommand();

           SqlDataAdapter dataAdapter = newSqlDataAdapter();

            comm.CommandType = System.Data.CommandType.StoredProcedure;

            comm =newSqlCommand(selectCommand, conn);

            dataAdapter =newSqlDataAdapter(comm);

            dataAdapter.Fill(datatable);

            conn.Close();

           return datatable;

        }

this is how the connection is done would I need the conn.close() here or does the fill() method take care of that?

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