Difference between rows.add and importRow

Question

When adding a row to a datatable in vb.net, what is the difference between rows.add and importRow?

Dim dt As DataTable
Dim dr As DataRow

'Add row this way...
dt.rows.add(dr)

'or this way.
dt.importRow(dr)

Answer 1

both do same functionality adding row to datatable but the main difference is

    DataTable dt1=new DataTable();
    DataRow dr1=dt1.NewRow();
    DataTable dt2=new DataTable();
    dt2.Rows.Add(dr1); // will give you error already dr1 belongs to another datatable in that                              //case you can do like this
    dt2.ImportRow(dr1); // safe
    dt1.Rows.Add(dr1); // safe as dr1 Row belongs to DataTable1 so no exception raise

hope that will give you an idea..

Answer 2

The suggested answer is incorrect. The MSDN article below shows that dt2.ImportRow(dr1) will NOT import dr1. This is because it is in a detached state. Also dt2 has not schema.

http://msdn.microsoft.com/en-us/library/system.data.datatable.importrow.aspx