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VS/C# Equivalent of Java/Eclipse "resource folder"?

While using Java in Eclipse IDE, one can add a folder to the "Build Path" using the "Add Class Folder" option in the "Libraries" tab, which allows the resources in that folder to get compiled inside the application's jar file, rather than outside or not at all.
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With this, one can get the resources inside the folder as a URL via the Class.getResource(String name)method. I am already informed about C#'s equivalent: Assembly.GetManifestResourceStream(string name) or Assembly.GetManifestResourceInfo(string resourceName) methods, but I am not aware of C#'s "Build Path" equivalence in Visual Studio (I am using 2019, if you wished to know). Could somebody please explain how I would accomplish Java's build path resource folder in C#?
(Note that I am looking to create a resource folder where anything put inside the folder would be considered an application resource. I am not looking for a way to add one or more resource files individually.)
Any replies would be greatly appreciated! :)

After a little research, I had found a solution for this problem. There are in fact two possible solutions to this issue.
.NET Core Solution
The first involves editing the .csproj file of your C# project. This solution is only available in .Net Core.
You can add this code snippet to your file and change the {PATH_TO_RESOUCE_FOLDER_HERE} folder to your desired folder.
<ItemGroup>
<EmbeddedResource Include="{PATH_TO_RESOUCE_FOLDER_HERE}\**" />
</ItemGroup>
Now any item placed in that folder will be considered an embedded resource Assembly.GetManifestResourceStream(string name) method.
Regular .NET Solution
The second method involves using a .resx file to encapsulate all of your resources
In Visual Studio 2019, you can create a .resx file by right clicking on the location in your project where you wish to add the file to, and navigating to Add > New Item (you may also press Ctrl+Shift+A). You can now navigate to the item that quotes "Resources File" and select it. You can now use this GUI to insert your resources (for a deeper explanation, click on this or this link. For use cases, see this MSDN).
The "Resources File" option
Note that this solution will also work in .NET Core.
I hope this answer helped you as much as it did me! :)

You just create a folder and name it as you like it, say 'Resources'. Add any file you want in there to be treated as a resource by your application.
Then navigate to the properties of every resource file (you can press F4) and in the menu you can choose what you want the compiler do with that file (Compile Action is the option name if I remember well). There you select the type as a resource, the namespace (your Build Path), and whether you like the file to be copied every time you compile your application, and so on.

Use solution-wide resources with WinForms

I have a Visual Studio 2017 solution, which is split in several C#-WinForm applications.
To have a similar user interface I put all the icons/pictures into one project (ResourceProject) and marked the resource file public.
By directly editing the .Designer-file of a Form I can now explicitly assign the Image to something from the resource file of the ResourceProject by stating
button1.Image = ResourceProject.Properties.Resources.DemoPic
However, from time to time, the designer overwrites this with
button1.Image = ((System.Drawing.Image)resources.GetObject("button1.Image")));
and creates a local resource file, which has the image embedded.
This is exactly what I wanted to avoid in the first place, since I might want to alter easily some icons later on and have those changes directly spread over all projects.
The only way to avoid it seems to be to assign the images not in the Designer file but in some other method in the actual form file.
Is there any other way around this problem?

You should not change designer.cs file, it's auto-generated and any change which you make in the file will be replaced with auto-generated code the next time which you change something in the form.
But to share image resources between multiple projects in a solution with design-time support, you can follow these steps:
Create a class library project, let's call it ResourceLibrary.
Add a Resx resource file to the root folder of the project with this name Resources.Resx.
Open the resource designer and change its Access Modifier to Public. (It will set its Custom Tool to PublicResXFileCodeGenerator)
Add a few images to the resource designer and save it.
Then in the Windows forms project do the following settings:
Add a reference to ResourceLibrary.
Right click on windows forms project and choose Add → Existing item...
Browse to the ResourceLibrary folder and choose Resources.Resx file.
Click on drop-down arrow of the Open button, and choose Add As Link.
Select Resource.Resx which has added to windows forms project and choose properties.
Set its Build Action to None
Set its Custom Tool to a text like None
Set its Custom Tool Namespace to the namespace of the resource in the other assembly: ResourceLibrary.
Rebuild the project.
Then for all the image properties you can choose the other resource file from drop-down in the Select Resource dialog. The code generation will generate correct code for the property and you have a correct build and it works as expected at design-time as well as run-time.
You can clone or download a working example here:
Repository
Download

asp.net file upload blank image files

I have written some code for saving an image to a folder in asp.net. My problem is that the image in the folder is white and is not the same as images added manually to the folder.
I used a simple asp.net fileupload control to save the file to the correct path. But the images dont display on the page and this is how the file icons look in visual studio.
Anybody know why this is?

Try Right-clicking the images and select "include in project"
edit
If you want to do that programmatically you need to modify the project file programmatically; that's all there is to it. It's an XML file with nothing special about it. Note, however, that you have this under source control and you'll probably need to do more than just modifying the project file (ie adding the file to source control too)

Yes, it is. Because it is not included as part of the project files.
Try this:
There isn't anything else that is wrong. Only the files are not tracked by VS, so they won't be published. Your files are still completely accessible from your code.
In my opinion, files like say images added to your web app shouldn't be part of the project.

You need to include them in the project by right clicking them and click Include In Project.
Furthermore, if you want these files to included in the build you need to go to Properties of each file and set Build Action as Content.

How can I use only a part of my assembly?

I want to split the components of my applications like:
Application A -> Component X <- Application B
without compiling Component X to a dll.
When I include the .cs, Visual Studio copies it to the application directory. I don't want that. I want to include the file and then use a part of it, like C's #define. For example if I have a ZIP library, I don't want to include the whole assembly if I need a decompression. What's the C# way to make this? Can I somehow tell VS to not copy the file and use #defines or maybe some method attributes?

An assembly is a single, complete file. If you want multiple assemblies which are only included as needed, you need to build them using multiple projects (one per assembly) and reference only the ones you want in the downstream projects you want.
Bigger question, however, is ... Why?

Don't create a problem where there isn't any.
Create a new dll, and MOVE .cs files that should be shared there. Build it, and have AppA and AppB reference and use that dll.
BTW, you can add reference from AppA to AppB, or from AppB to AppA, but not at the same time because it will create circular reference.
And if you want to stick to your idea, LINK your code files as Chris suggested, and use:
#if APPA
// code for AppA
#endif
To have pieces of code compile just in one application. Use project level #defines (project properties) to define APPA and APPB in their respective projects.

You can link to source files in Visual Studio, rather than copying them into in your project. Right click on the folder where you want to put the file, click "Add Existing Item", find the file that you want to add in the dialog, and before hitting Open, note the little down arrow next to the Open button. Click that, and click add as link.
Documentation here: http://msdn.microsoft.com/en-us/library/9f4t9t92(v=VS.100).aspx

Add Existing Item...
Browse to the file you want to include.
Instead of selecting "add", press the arrow to the right of the "Add" button and select "Link" in the drop down.
/B

May be you need Multifile Assembly?

C# SciLexer.dll question

I am using ScintillaNET a wrapper of the Scintilla control. I've edited the a lexer a bit and would like to try and see if the changes work, but the problem is I don't know which SciLexer.dll file it's using on my computer. The one in the application's directory did not seem to make a difference.
So my question is basically, how do I know which SciLexer.dll file my application is using and how can I set it to use the one in the application's directory?

Using Visual Studio, check to see which DLL your project references:
With your project/solution open, expand the "References" folder in the Solution Explorer, and locate the name of the SciLexer.dll you are currently referencing.
Double-click on the relevant assembly to display it in the Object Browser.
In the bottom-right pane of the Object Browser, you will see the full path on disk to the specific DLL that your project is referencing.
This is the DLL that you need to change/update. Or, you could remove the existing reference and add a new one to the DLL in the directory that you want your application to use.