Question

Greetings everyone-

In my code below I’m trying to add a Row from an existing DataTable (dtResult) into a new DataTable (dtCopyResult) if email address does not match. So I guess my knowledge of ADO.NET is not up to par because whenever I try to run my below code, I get an “This Row already belongs to another table”. Please let me know how I can fix this..

Many Thanks

 if (checkBox1.Checked)  
                    {

                        for (int i = dtResult.Rows.Count - 1; i >= 0; i--)  //dtResult is a DataTable
                        {
                            foreach (object email in emails)  //emails is an ArrayList of email addresses
                            {
                                if (email.ToString().ToUpper() != dtResult.Rows[i][3].ToString().ToUpper())
                                {
                                    dtCopyResult.Rows.Add(dtResult.Rows[i]);  //dtCopyResult is a new blank DataTable that I'm trying to add rows to
                                }
                            }

                        }

                    }

Answer 1

As the error message tells you, a DataRow belongs to a particular DataTable; you cannot just take it and add it to another one. What you can do is either

• create a new DataRow and fill it with the values from the old DataRow or

• use the DataTable.ImportRow method:

  dtCopyResult.ImportRow(dtResult.Rows[i]);