The properties set on project level apply to all files in the project.
                   
               
            
 
            
             
               
               - In Solution Explorer, click the project whose properties you want to set. 
                  
               
  
               
               - Click 
                  Project > 
                  project_name properties. 
                  
               
  
               
               - Click a tab in the left hand side of the editor to open a particular properties page.
                  
               
  
               
               - Set the properties as required. 
                  
               
  
               
               - Click 
                  File > 
                  Save All to save your changes.