private void Update_Click(object sender, EventArgs e)
        {
            try
            {
                OleDbConnection connection = new OleDbConnection();
                connection.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\user\Desktop\Student\Database.accdb;
Persist Security Info=False;";
                connection.Open();

                OleDbCommand command1 = new OleDbCommand();
                command1.Connection = connection;
                command1.CommandText = "select * from Student where ID=" + Load_txt.Text;
                OleDbDataAdapter da = new OleDbDataAdapter(command1);
                DataTable dt = new DataTable();
                da.Fill(dt);
                dataGridView1.DataSource = dt;
                command1.ExecuteNonQuery();
                connection.Close();

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString(), "error");
            }
        }