Copy a datatable into another datatable in C#

From the title this sound as simple as doing this:

                foreach (DataRow dr in dt.Rows)

                {

                    dttemp.Rows.Add(dr);

                }

But it does not work this way, It gives error  that data row belongs to another table . So, how would you copy a datatable into another datatable:

First have to clone the structure of datatable:           

            dttemp = dt.Clone();

And, then need to import the rows:

                foreach (DataRow dr in dt.Rows)

                {

                           //Conditional copy

                        dttemp.ImportRow(dr);

                   

                }

For copying complete datatable, we have:

dttemp = dttemp.Copy();