ช่วยหน่อยคับ บันทึกข้อมูล จาก DataGridView มันไม่ยอมหยุดให้คับทำไงคับ

               for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
                {

                    sb.Remove(0, sb.Length);
                    sb.Append("insert into data1(name,lastname,surname,phone)values(@name, @lastname, @surname, @phone)");
                    string savdata1 = sb.ToString();

                    com = new SqlCommand();
                    {
                        com.CommandType = CommandType.Text;
                        com.CommandText = savdata1;
                        com.Parameters.Clear();
                        com.Connection = con;

                        com.Parameters.Add("@name", SqlDbType.VarChar).Value = dataGridView1.Rows[i].Cells[0].Value;
                        com.Parameters.Add("@lastname", SqlDbType.VarChar).Value = dataGridView1.Rows[i].Cells[1].Value;
                        com.Parameters.Add("@surname", SqlDbType.VarChar).Value = dataGridView1.Rows[i].Cells[2].Value;
                        com.Parameters.Add("@phone", SqlDbType.VarChar).Value = dataGridView1.Rows[i].Cells[3].Value;
                        com.ExecuteNonQuery();
                        
                    }
                                        
                }