References between projects in Asp.net

1: References between solutions (that is, references between projects). When the output path of a project is, the Reference Path of another project is. For example:

After the output path of the model is changed, the reference path in the project is automatically changed. You can change the output path to any folder. The generated file reference path is automatically changed to the corresponding output path of the file.

2: non-project references. This reference outputs the file to the specified folder and adds the reference of the project. The reference path cannot be changed at will, if the reference project cannot be found when the reference path is changed, an error is reported.