No ASP.NET MVC 5, para que um auxiliar de HTML personalizado (Custom HTML Helper) possa ser invocado como @Html.Quoted("...

Public Shared Class MyExtension
Public Shared Function Quoted(
this ByVal helper As HtmlHelper,
ByVal text As String
) As String
Return """" & text & """"
End Function
End Class

Public Module MyExtension
Public Function Quoted(
ByVal helper As HtmlHelper,
ByVal text As String
) As String
Return """" & text & """"
End Function
End Module

Imports System.Runtime.CompilerServices
Public Module MyExtension
<Extension()>
Public Shared Function Quoted(
this helper As HtmlHelper,
ByVal text As String
) As String
Return """" & text & """"
End Function
End Module

Imports System.Runtime.CompilerServices
Public Module MyExtension
<Extension()>
Public Function Quoted(
ByVal helper As HtmlHelper,
ByVal text As String
) As String
Return """" & text & """"
End Function
End Module

Imports System.Runtime.CompilerServices
Public Class MyExtension
<Extension()>
Public Shared Function Quoted(
ByVal helper As HtmlHelper,
ByVal text As String
) As String
Return """" & text & """"
End Function
End Class