How to convert DataGridView DataTable / DataGrid to DataTable

How to convert DataGridView DataTable

private DataTable ToDataTableASM(DataGridView dataGridView, string tableName)

        {

            DataGridView dgv = dataGridView;

            DataTable table = new DataTable(tableName);

            // Create  columnas

            for (int iCol = 0; iCol < dgv.Columns.Count; iCol++)

            {  

                    table.Columns.Add(dgv.Columns[iCol].Name);

            }

            /* THIS WORKS  DataGrid to DataTable... */

            foreach (DataGridViewRow row in dgv.Rows)

            {

                DataRow datarw = table.NewRow();

                for (int iCol = 0; iCol < dgv.Columns.Count; iCol++)

                {

                    try

                    {

                        datarw[iCol] = row.Cells[iCol].Value;

                    }

                    catch (Exception ex)

                    { }

                }

                table.Rows.Add(datarw);

            }

            return table;

        }