EF combined with sqlbulkcopy batch insert data

        /// <summary>
        ///  Batch insert data into table 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="connectstring"> string connStr=ConfigurationManager.ConnectionStrings["CodeFirstModel2"].ToString();</param>
        /// <param name="tableName"> Table name </param>
        /// <param name="list">IList</param>
        public  void AddByBluckCopy<T>(string connectstring, string tableName, IList<T> list)
        {

            using (SqlBulkCopy bulk = new SqlBulkCopy(connectstring))
            {
                bulk.BatchSize = list.Count;
                bulk.DestinationTableName = tableName;

                var table = new DataTable();
                var props = TypeDescriptor.GetProperties(typeof(T)).Cast<PropertyDescriptor>()
                    .Where(propertyInfo => propertyInfo.PropertyType.Namespace.Equals("System"))
                    .ToArray();
                foreach (var propertyInfo in props)
                {
                    bulk.ColumnMappings.Add(propertyInfo.Name, propertyInfo.Name);
                    table.Columns.Add(propertyInfo.Name, Nullable.GetUnderlyingType(propertyInfo.PropertyType) ?? propertyInfo.PropertyType);
                }

                var values = new object[props.Length];
                foreach (var item in list)
                {
                    for (var i = 0; i < values.Length; i++)
                    {
                        values[i] = props[i].GetValue(item);
                    }

                    table.Rows.Add(values);
                }

                bulk.WriteToServer(table);
            }
        }