how to give the absolute path ?

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C#

hello friends,


i have developed a code which is given a image retriving , in this while execution image are retrived and executed , but when i created a setup file and installs i does'nt shows the image .
getting error this file is not exist.

please suggest me , how to give the absolute path in this project.
thanks in advance.

string path = (@"../PatientsPhotos/" + this.patientid + ".jpg");



               if (File.Exists(path))
               {
                   ImageSource imageSource = (ImageSource)imgConv.ConvertFromString(path);
                   imgVideo.Source = imageSource;
               }
               else
               {

                   file doesn't exist;
               }