Getting list of values out of list of objects

Use as follows.

Categories.Select(c => c.Id).ToList();

List<int> list = new List<int>();
foreach (Category item in Categories)
{
    list.Add(item.Id);
}

This expression gives you the list you want:

    Categories.Select(c => c.Id).ToList();

Also, don't forget

    using System.Linq;

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