net481 
namespace System.Web
{
    public sealed class HttpContext : IServiceProvider
    {
        [Obsolete("The recommended alternative is System.Web.Configuration.WebConfigurationManager.GetWebApplicationSection in System.Web.dll. http://go.microsoft.com/fwlink/?linkid=14202")]
        public static object GetAppConfig(string name);
    }
}
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Reference this API
.NET Framework 1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

System.Web , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs an assembly reference to System.Web.

Obsolete The recommended alternative is System.Web.Configuration.WebConfigurationManager.GetWebApplicationSection in System.Web.dll. http://go.microsoft.com/fwlink/?linkid=14202
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API