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发生回发时，我认为它会将现有文件路径作为预加载并删除.出于安全原因，您无法预加载a的名称文件放入FileUpload控件.

以下链接将提供解决方案.
维护回发中的文件上传控制

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Hello,

I have a asp.net form on which i am using fileupload control. I choose a file to be uploaded but each time if i click on any check box,button which causes postback, the chosen file gets lost/removed from the fileupload control.Every time after checking check box or postback i have to reselect file from fileuploader. Please help me to get rid of this problem.

thankyou,
regards,
gauri

Have a look at This[^]

hope it helps :)

When there is a postback I think it takes the existing file path as a preload and takes it off.For security reasons, you cannot pre-load the name of a file into the FileUpload control.

Following link will provide the solution.
Maintain File Upload Control on Postbacks