Listbox selected item

file4.cs

//Making a sample list from the data given above
        public void makeasamplelist()
        {
            for (int i = 0; i < 6; i++)
            {
                //Create a new instace of the class
                Resultclass obj = new Resultclass();

                //Add the sample data
                obj.name = arrayofnames[i];
                obj.marks = arrayofmarks[i];

                //Add the the item object into the listbox
                mylistbox.Items.Add(obj);
            }
        }