使用DataGridView.UserAddedRow Event（System.Windows.Forms） [ ^ ]

use DataGridView.UserAddedRow Event (System.Windows.Forms)[^]

private void dataGridView1_UserAddedRow(object sender, DataGridViewRowEventArgs e)
       {
           if (dataGridView1.Rows.Count > 4)
           {
               dataGridView1.AllowUserToAddRows = false;
               MessageBox.Show("you cant exceed this number");
           }
           else
           {
               dataGridView1.AllowUserToAddRows = true;

           }

       }