System.Data.Common.DbParameterCollection.Add C# (CSharp) Метод

        public abstract int Add(object value);

        public static System.Data.DataTable mCashs_SumBrand(DateTime NgayBatDau, DateTime NgayKetThuc)
        {
            using (DbCommand DbCommand = clsConnect.DbConnection.CreateCommand())
            {
                DbCommand.CommandText = SpMobile_Cashs_SumBrand;
                DbCommand.CommandType = System.Data.CommandType.StoredProcedure;

                System.Data.Common.DbParameterCollection Parameters = DbCommand.Parameters;
                System.Data.Common.DbParameter           Parameter;

                Parameter = DbCommand.CreateParameter();
                Parameter.ParameterName = PNgayBatDau;
                Parameter.Value         = NgayBatDau;
                Parameters.Add(Parameter);

                Parameter = DbCommand.CreateParameter();
                Parameter.ParameterName = PNgayKetThuc;
                Parameter.Value         = NgayKetThuc;
                Parameters.Add(Parameter);

                DbDataAdapter DbDataAdapter = clsConnect.DbProviderFactory.CreateDataAdapter();
                DbDataAdapter.SelectCommand = DbCommand;
                System.Data.DataTable DataTable = new System.Data.DataTable("TABLE");

                try { DbDataAdapter.Fill(DataTable); }
                catch { DataTable = null; }

                return(DataTable);
            }
        }