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How to send email with Multiple Attachments in ASP.Net Website

1. When I click attack, depending on what PC I use, the selected file gets displayed or I get IO error.

What could be causing this?

The Uploads folder has permissions already.

2. When the selected file goes get displayed, it does not store the selected files into the Uploads folder.

3, When I click the [x] to remove a file, it does not remove the file.

when I click the attach files button, I get IO Error.