private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
dataGridView1.Rows.Clear();
try
{
int a = int.Parse(comboBox1.SelectedValue.ToString());
DataTable dt = bllss4.getPartBySource(a);
comboBox3.DataSource = dt;
comboBox3.DisplayMember = "PartName";
comboBox3.ValueMember = "PartID";
}
catch (Exception)
{
}
}