No overload for 'node_changed' matches delegate 'System.Even

How to solve this error : No overload for 'node_changed' matches delegate 'System.EventHandler'

hi, i have done treeview in asp.net.

+football.

here + is having one property called "OnTreeNodePopulate" and Football contains property called "OnSelectedNodeChanged".

i designed in aspx page like follows:

so, when i click + it invokes in aspx.cs page like follows:

       protected void Pluspopulate_clicked(object sender, TreeNodeEventArgs  e )

        {

session["aaa"]=e.node // here i can get current node

            //here i am passing two argument to populateSublevel method ie id and current node.

            PopulateSubLevel(Convert.ToInt32(e.Node.Value),' " + session["aaa"] + " ');

        }

Till now fine. but when click on football, it invokes following aspx.cs page:

 protected void Node_changed(object sender, Eventargs  e )

        {

            //here  also i want to pass two argument to populateSublevel method ie id and current node. like what i get in pluspopulate_cliked event.

// But here i am not able to get current node. here i need to get current node.

session["aaa"]=e.node // i need like this. but here i am not able get current node

            

        }

so when i give TreeNoeEventArgs e in Node_changed, it throws an error like " No overload for 'node_changed' matches delegate 'System.EventHandler'"

how to solve this . how to can i get current node in node_chaged event.