Question

I want to do this:

    public void UpdateDataRowsToDataTable(string tableName, List<DataRow> rows)
    {
        foreach (DataRow row in rows)
        {
            // this method does not exist!!
            _dataSet.Tables[tableName].Rows.Update(row);
        }
    }

I need a method that finds a row (maybe by primary key) and updates changed rows to the row in DataTable.

The only possibility what I know is to use Select (or Find) and then maybe iterate all columns and give them new values. Please tell me that this cannot be true!

Answer 1

Although the question is not quite clear it sounds like you have a group of rows from one table and want to update the equivalent rows in another datatable. If this is the case they you can just use the find method and manually update them as you suggested, or alternatively, add the new rows to another table and merge them (there are all sorts of options for merging two data tables). Merging however will just do the same thing under the hood (i.e. find by primary key and update the columns).

Another way would be to just replace the row and set its status to modified datarow.SetModified()