use of “using” keyword in c# [duplicate]

Answer 1

"using" keyword can also be used to make type aliases. Here Item is an alias to Dictionary. This approach can save you some typing :)

For instance,

using Item = System.Collections.Generic.Dictionary;
namespace Sample
{
    using Records = Dictionary;
    public class Controller
    {
      Records recordDictionary = new Records();
    }
}