I found the solution like that
I have created a separate folder outside the Project Folder / Application Folder with the name Customize which is in D:\ and put all the crystal reports in that folder. Path is like that
string reportFullPath = @"D:\Customize\rptStuContact.rpt";
After the creation of the setup file, I installed the setup and then load my crystal report from this path
string reportFullPath = @"D:\Customize\rptStuContact.rpt";
now it is loading successfully.