How we can access folder of another application for saving Image on server

I have two applications on server, I want to access first application's folder from second application. First application is ASP.NET application and second application is ASP.NET MVC application. I want to save an image in first application's folder from second (MVC) application. But while saving image, I have to give folder path but I don't know how to specify complete folder path from second application. I know that Server.MapPath() can be used to map virtual address of folder to its physical address but can I use it to access another application's folder path also? I am new in MVC . Please help me regarding this...................