linq - Using Linq in .NET Handlers

Question

I have a Handler and I am trying to perform LINQ operations. However I cannot. Is it possible to do this in .ASHX files?

using (UserDataContext userDataContext = new UserDataContext)
{
    User user = userDataContext.Users.Single -- Does not show up as an option in intellisense.
}

Thanks

Answer 1

是否添加了导入？

using System.Linq;