Stored Procedure to provide results gives exception in c# code

[dbrewerton]

Ok, I'm not exactly certain what the problem is here but I will say I'm frustrated. The Stored Proc if directly executed works fine. When I try using it as part of loading a data table, it give an exception. However, the exception isn't really giving me any specific conditions, it says there's a problem but no details. My code:

                try
                {
                    using (SqlCommand command = new SqlCommand("sp_TestProc", sqlconn))
                    {
                        command.CommandType = CommandType.StoredProcedure;
                        sqlconn.Open(); // opening the connection

                        SqlDataReader dr = command.ExecuteReader(); // this is where it goes south


                        DataTable dtt = new DataTable();
                        dtt.Load(dr);
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Error: " + ex.ToString());
                }
                finally
                {
                    sqlconn.Close();
                }