how to get the selected item id in list box using c# winforms

Question

I have list box(lstcategories) .. filled with items coming from database by using the below code ...

     private void getcategorynames()
     { 
        var categorytypes = (from categories in age.categories
                       select categories.category_Name).ToList();


        foreach (string  item in categorytypes)
        {

            listcategories.Items.Add(item);


        }

my problem is if i click on the item in list box i need to do something.. like that

if i click on the category name(list box item) i need to pass the selected category name to the database

can any one pls help on this...

Answer 1

ListBox.Items is a collection of objects, so you can store the category object itself instead of the string representation of it.

age.Categories.ToList().ForEach((c) => listcategories.Items.Add(c));

Then in ListBox.SelectedIndexChanged

Category category = (Category)listcategories.SelectedItem;
// Do something with category.Id

If you want to do it all inline

private void getcategorynames() {
    age.Categories.ToList().ForEach((c) => listcategories.Items.Add(c));
    listcategories.SelectedIndexChanged += (sender, e) => {
        Category category = (Category)listcategories.SelectedItem;
        // Do something with category.Id
    };
}