private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
        {
            //selected_index_treeview=treeView1.SelectedNode.Index;
            //selected_index_host_listbox_new = host_listbox_new.SelectedIndex;
            string mcn = "";
            host_config sm = new host_config();

            if (treeView1.SelectedNode != null && treeView1.SelectedNode.Text != "Servers")
            {
                //connect_server_bttn.Enabled = true;
                mcn = treeView1.SelectedNode.Text;
                sm = host_list[mcn];
            }
            if (sm.connected)
            {    //connect_server_bttn.Text = "DISCONNECT";
                server_context_menu_strip.Items[2].Text = "DISCONNECT";
                treeView1.SelectedNode.ImageIndex = 0;
                treeView1.SelectedNode.SelectedImageIndex = 0;
            }
            else
            {
                server_context_menu_strip.Items[2].Text = "CONNECT";
                treeView1.SelectedNode.ImageIndex = 1;
                treeView1.SelectedNode.SelectedImageIndex = 1;
                dataGridView1.DataSource = null;
                dataGridView1.Rows.Clear();
                dataGridView1.Columns.Clear();
            }
            dataGridView1.DataSource = null;
            switch_server(sm);
            //if (sm.process_list != null)
            //{

            populate_grid_view(sm);

        }




private void treeView1_NodeMouseClick_1(object sender, TreeNodeMouseClickEventArgs e)
        {
            treeView1.SelectedNode = treeView1.GetNodeAt(e.X, e.Y);
            if (e.Button == MouseButtons.Right)
            {
                server_context_menu_strip.Show(Cursor.Position);
            }
        }


  private void con_discon_Click(object sender, EventArgs e)
        {
            int index = treeView1.SelectedNode.Index;


           // int index = host_listbox_new.SelectedIndex;

            try
            {
                string sitem = treeView1.SelectedNode.Text;// host_listbox_new.Items[index].ToString();
                //host_list[sitem].checked_event=e;
                if (host_list[sitem].connected)
                {
                    treeView1.SelectedNode.ImageIndex = 0;
                    treeView1.SelectedNode.SelectedImageIndex = 0;

                }

                if (!host_list[sitem].is_busy)
                {
                    host_list[sitem].con_worker.RunWorkerAsync();
                }

                else
                {
                    host_list[sitem].connected = false;
                    treeView1.SelectedNode.ImageIndex = 1;
                    treeView1.SelectedNode.SelectedImageIndex = 1;
                }
                //connect_server_bttn.Text = "DISCONNECT";

            }

            catch (ArgumentOutOfRangeException ex)
            {
                MessageBox.Show("No machine is selected", "Invalid Operation");
            }

            catch (Exception ex)
            {
                output_textbox.AppendText("connection failed..............." + ex.ToString() + Environment.NewLine);

            }


        }