private void thêmMớiSảnPhẩmToolStripMenuItem_Click(object sender, EventArgs e)
{
FormTTB ftb = new FormTTB();
this.Close();
ftb.Show();
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection cnn = new SqlConnection(str);
cnn.Open();
string sql1 = "insert into Kho values(@matb,@sl)";
SqlCommand command = new SqlCommand(sql1, cnn);
command.Parameters.AddWithValue("matb", txtTB.Text);
command.Parameters.AddWithValue("sl", txtNS.Text);
command.ExecuteNonQuery();
FormTTB ftb = new FormTTB();
this.Hide();
ftb.Show();
}