What is the meaning of C# with shortcut icon appears in visual studio 2010?

Question

Working on some legacy codes - what is the c# class with black arrow overlay icon in visual studio 2010 and why it appears?

Answer 1

It means that you have a link to an existing item.

This technique is used when you want to share code.

When you edit the file with the described Icon, it also changes the source where it has been linked from.

Edit: To create a link to an existing item: (taken from MSDN)

1. In Solution Explorer, select the target project.
2. On the Project menu, select Add Existing Item.
3. In the Add Existing Item dialog box, locate and select the project item you want to link.
4. From the Add button drop-down list, select Add As Link.