private void cmdShow_Click(object sender, EventArgs e)
{
localhost.Service1 myserver = new localhost.Service1();
BindingSource bs = new BindingSource();
bs.DataSource = myserver.show();
gv1.DataSource = bs;
gv1.Columns[3].Visible = false;
// gv1.Columns[2].Visible = false;
gv1.Columns[4].Visible = false;
}