Extension Method and Razor Page

Question

I have defined an extension method in app_code like below.

public static class Extensions
{
    public static string Hi(this object obj)
    {
        return         


        

Answer 1

C# only allows you to call extension methods qualified by an object instance.
If you have an extension method that extends your type, you can't call it "directly"; you need to write this.ExtensionMethod().

The only way to do what you're asking for is to make a class which inherits WebPage (or WebViewPage for MVC views) and change your Razor page to inherit that class (using the @inherits directive)