Nov 28, 2011 08:51 PM|Decker Dong - MSFT|LINK
Question - How to save the dataGridView or dataset and add extra columns, like the current datetime, into SQL Server?
Your question can be divided into two parts：
1）Adding an extra column——That's easy, what you do is just call "DataTable.Columns.Add("ColumnName",typeof(ColumnName)) and assign values in the "for-each" body。
2）Saving into db——It's an extra column, no real mapping columns in the db，So I'm afraid you cannot do that。