copy selected data from datagrid to another

http://canlu.blogspot.in/2009/06/copying-datagridviewrow-to-another.html

http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridviewrow.clone.aspx

i find this code :

private void button1_Click(object sender, EventArgs e)
       {

           foreach (DataGridViewRow row in this.table1DataGridView.SelectedRows)
           {
               object[] rowData = new object[row.Cells.Count];
               for (int i = 0; i < rowData.Length; ++i)
               {
                   rowData[i] = row.Cells[i].Value;
               }
               this.copyDataGridView.Rows.Add(rowData);
           }
       }

but it throw an exception:

Additional information: Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound.

is the code correct??what should i do?