using Directives Clause Samples

using Directives. Group using directives by common prefix, with shorter namespaces coming before longer ones, creating neat clusters of statements separated by single empty lines. Namespaces should be ordered in increasing order of platform specificity, with .NET namespaces first, then library or component namespaces, then Xamarin namespaces, then application namespaces: using System.Linq; using System.Collections.Generic;