db.tables.InsertAllOnSubmit(list);
db.SubmitChanges();

insert into tables(id, txt) VALUES (1, N'111 ', '20080923'), (2, N'222');

insert into tables(id, txt) VALUES (1, N'111')
insert into tables(id, txt) VALUES (2, N'222')

        public void BulkInsertAll<T>(IEnumerable<T> entities)
        {
            entities = entities.ToArray();

            string cs = Connection.ConnectionString;
            var conn = new System.Data.SqlClient.SqlConnection(cs);
            
            conn.Open();

            Type t = typeof(T);

            var tableAttribute = (TableAttribute)t.GetCustomAttributes(
                typeof(TableAttribute), false).Single();
            var bulkCopy = new System.Data.SqlClient.SqlBulkCopy(conn)
            {
                DestinationTableName = tableAttribute.Name, BulkCopyTimeout=0
            };

            var properties = t.GetProperties().Where(EventTypeFilter).ToArray().Take(12);
            var table = new DataTable();

            foreach (var property in properties)
            {
                Type propertyType = property.PropertyType;
                if (propertyType.IsGenericType &&
                    propertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
                {
                    propertyType = Nullable.GetUnderlyingType(propertyType);
                }

                table.Columns.Add(new DataColumn(property.Name, propertyType));
            }

            foreach (var entity in entities)
            {
                table.Rows.Add(properties.Select(
                  property => GetPropertyValue(
                  property.GetValue(entity, null))).ToArray());
            }
             
            bulkCopy.WriteToServer(table);
            conn.Close();
        }