.net - Insert Value In Datatable And Pass It Into A Method?

i just use this code to insert value in datatable and pass this table in method
look code---

public class RoomBO
{
DataTable dt;
RoomDal objRoom = new RoomDal();
public int insert(int room,string bedType, int bed, int charge)
{
//adds the details of the new room
dt = new DataTable();
dt.Columns.Add(new DataColumn("Column1"));
dt.Columns.Add(new DataColumn("Column2"));
dt.Columns.Add(new DataColumn("Column3"));
dt.Columns.Add(new DataColumn("Column4"));
DataRow dr;
dr = dt.NewRow();
dr["Column1"] = room;
dr["Column2"] = bedType;
dr["Column3"] = bed;
dr["Column4"] = charge;
objRoom.Save(dt);
return 1;
}

*on data access layer*

public int Save(DataTable dataTable) //adds the details of the new room
{
ada = new SqlDataAdapter("room_insert", con);
//DataRow r= dataTable.NewRow();
ada.SelectCommand.CommandType = CommandType.StoredProcedure;
ada.SelectCommand.Parameters.AddWithValue("@room_no",
Convert.ToInt32(dataTable.Rows[0][0]));
ada.SelectCommand.Parameters.AddWithValue("@room_type",
Convert.ToString(dataTable.Rows[0][1].ToString()));
ada.SelectCommand.Parameters.AddWithValue("@no_bed",
Convert.ToInt32(dataTable.Rows[0][2]));
ada.SelectCommand.Parameters.AddWithValue("@charge",
Convert.ToInt32(dataTable.Rows[0][3]));
ds = new DataSet();
ada.Fill(ds);
return -1;
}

i am not getting any error but value is not insert to my database