C# windows forms treeview and listview

i populated the treeview from Common table structure from sql in window forms
i have to show the after the click on parent node in treeview the related child show
in listview.i set for parent and child. [flag id flag zero means he is parent and flag 1 means he have parent. ]so i dont know how to do plz tell me.how can i do it???so how can i show after clicked on parent node in treeview and related child in list view.i am new for C# programing.
i have one table name in sql is tblHead in that i have four field (headid,headname,flag,type)
here is my code:
i populated treeview in leftside in windows foms but in the rightside i have listview in that i have to show child .when i click the parent node in treeview .so i can i do plz tell me???

private void Form1_Load(object sender, EventArgs e)
        {
            Connection c = new Connection();
            string con1 = c.getconnstr();
            con.ConnectionString = con1;

            //Connection Open Here
            con.Open();
            // Clear the dataset
            ds.Clear();
            string str = "select * from tblhead";
            SqlDataAdapter da = new SqlDataAdapter(str, con);

            //DataSet Fill Here
            da.Fill(ds, "Parent");
            
            treeView1.BeginUpdate();
            treeView1.Nodes.Clear();

            //Call the function and pass treeview node,parent element and table
            CreateTreeView(treeView1.Nodes, 0, ds.Tables[0]);
            //treeView1.Nodes[0].Expand();
            treeView1.Select();
            treeView1.EndUpdate();
            con.Close();
        }
        protected void CreateTreeView(TreeNodeCollection parentNode, int parentID, DataTable mytab)
        {
            foreach (DataRow dta in mytab.Rows)
            {
                if (Convert.ToInt32(dta["flag"]) == parentID)
                {
                    String key = dta["headid"].ToString();
                    String text = dta["headname"].ToString();
                    TreeNodeCollection newParentNode = parentNode.Add(key, text).Nodes;
                    CreateTreeView(newParentNode, Convert.ToInt32(dta["headid"]), mytab);
                }
            }
        }

Tags: C#