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private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
string m_str = e.Node.Text;
SqlConnection connection = new SqlConnection(@"server=B321451588E441A\SQL2005;database=Northwind;uid=sa;pwd=111");
string constr = "select * from Orders where OrderID=" + m_str;
SqlDataAdapter sda = new SqlDataAdapter(constr,connection);
DataSet ds = new DataSet();
sda.Fill(ds, "abc");
this.dataGridView1.DataSource = ds.Tables["abc"];
}