如何确定当前所选的节点或子点，并在其下创建新的节点或子点？ 最好能给我个完成例子。我初学者，谢谢各位大侠！！！！
添加父节点 TreeView1.Nodes.Add(new TreeNode(reader[1].ToString(),reader[0].ToString())); using (SqlConnection mycon = new SqlConnection(sqlstr)) { mycon.Open(); SqlCommand mycom = new SqlCommand( "select id,dutyName from duty where deptID = @deptID ", mycon); mycom.Parameters.Add( "@deptID ", reader[0].ToString()); SqlDataReader myreader = mycom.ExecuteReader(); while (myreader.Read()) { //添加子节点 TreeView1.Nodes[i].ChildNodes.Add(new TreeNode(myreader[1].ToString(),myreader[0].ToString())); using (SqlConnection sqlcon = new SqlConnection(sqlstr)) { sqlcon.Open(); SqlCommand sqlcom = new SqlCommand( "select userID,username from userview where dutyID = @dutyID ", sqlcon); sqlcom.Parameters.Add( "@dutyID ", myreader[0].ToString()); SqlDataReader sqlreader = sqlcom.ExecuteReader(); while (sqlreader.Read()) { TreeView1.Nodes[i].ChildNodes[j].ChildNodes.Add(new TreeNode(sqlreader[1].ToString(),sqlreader[0].ToString())); } } j = j + 1; } } i = i + 1; }