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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(288, 43%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EM%3C/text%3E%3C/svg%3E)
I am in a C# WPF project
I have a program that receives the file stored in binary form in SQL Server and puts it in a folder in the TEMP path.
For example: there is a photo in the database, I select it and writeAllBytes in the temp, then using Process.Start(C:\temp.myiamge.png) I run that photo through the Windows Photo Viewer.
What I need:
I don't know how and when I can check to delete the file I wrote in the temp path after closing the Windows Photo Viewer window?
Does anyone have any recommendations?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(291.2, 11%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHL%3C/text%3E%3C/svg%3E)
Hi,@Mojtaba_Hakim . I see you have posted the similar query : https://learn.microsoft.com/en-us/answers/questions/1050485/why-does-the-process-return-null-if-we-use-process.html
Is your problem solved there? If the issue still persist, I would like to work closer on this issue.
Maybe you can delete all of the accumulated files when your program exits.
I don't know how and when I can check to delete the file I wrote in the temp path after closing the Windows Photo Viewer window?
If you don't know that how should we?