.NET component and COM server

Issue 1789: When is a .NET namespace implemented by a .NET Framework component?

Reported by Paige Neville, Dec 13, 2018

(Yet another question from my "Clearly I'm the only idiot out 
here" series.)

When I need to use a class from the .NET Framework, I dutifully look 
up the documentation to determine the corresponding namespace and 
then add a "using" directive to my source code:

using System.Text.RegularExpressions;
Usually I'm good to go at this point, but sometimes Intellisense 
doesn't recognize the new class and the project won't build. A quick 
check in the Object Browser confirms that I have the right 
namespace. Frustration ensues.

Using HttpUtility.UrlEncode() involved adding the appropriate 
directive:

using System.Web;
But it also required adding a reference to .NET Framework Component 
for System.Web, i.e. right-click the project in Solution Explorer, 
select Add Reference and add System.Web from the .NET tab.

How might I discern from the documentation whether a .NET namespace 
is implemented by a .NET Framework Component that must be 
referenced? I'd rather not hunt through the available components 
every time I use a namespace on the off chance that a reference is 
needed.

(For those who like to stay after class and clean the erasers: Will 
Organize Usings > Remove and Sort also remove references to 
componenents that are not used elsewhere in the project? How do you 
clean up unnecessary references?)

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Created: 1 year 9 months ago by Paige Neville

Updated: 7 months 22 days ago

Status: New

Followed by: 18 persons

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