net481 
namespace System.Web.WebPages
{
    public static class StringExtensions
    {
        public static bool IsDecimal(this string value);
    }
}
.NET Framework 4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Web.WebPages , Version=3.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to Microsoft.AspNet.WebPages.

Package Microsoft.AspNet.WebPages (3.3.0) net45
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API