private void cmdShowAll_Click(object sender, EventArgs e)
{
localhost.Service1 myserver = new localhost.Service1();
BindingSource bs = new BindingSource();
bs.DataSource = myserver.search();
gv.DataSource = bs;
gv.Columns[0].Visible = false;
gv.Columns[1].Visible = false;
gv.Columns[2].Visible = false;
gv.Columns[6].Visible = false;
}