动态地在组合框中添加项目，并且用户添加的项目应该是永久的而不使用数据库，这可能吗？

Question

Can we add the items in the combobox located on the window form dynamically ? Like there are 7 combobox on the window form and when the application is run user should be able to add the item(s) in the combobox.And items added by user should be permanent in the combobox.

Answer 1

Sure, just use the Items collection:

comboBox1.Items.Add(...);

And they are permanent in the way that they persist until the combo box ceases to live. If you want to retain the items through application shutdown or closing the form then you'll need to do that yourself.

You can also bind the combo box to a collection you're keeping elsewhere with the ItemsSource property. But you'll still need to take care of saving and loading the collection contents as needed.

You may want to elaborate a bit on what exactly you expect and need.

Answer 2

If you are using ASP.NET by default the items will persist in the viewstate and the selected item will remain between postbacks. You will only need to load the combobox once.