public void AddCourseItem(string id, string courseName, string score, string teacher)
{
var newItem = new CourseItem(id, courseName, score, teacher);
this.allItems.Add(newItem);
this.selectedItem = null;
}
public void AddCourseItem(CourseItem newItem)
{
this.allItems.Add(newItem);
this.selectedItem = null;
}
