How to attach multiple files to mail from single file upload control

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ASP.NET

C#4.0

I am trying to attach multiple Image files to mail from file upload control.
Its being attached but when I am trying to open those image its not opening.

below codes for more clarity

 using (MailMessage mm = new MailMessage(senderId, receiverId))
         {
                   
            foreach (HttpPostedFile uploadedFile in imgUpload.PostedFiles)
             {
               string FileName = Path.GetFileName(uploadedFile.FileName);
               mm.Attachments.Add(new Attachment(uploadedFile.InputStream, FileName));
             }
}

where imgUpload= file upload control with AllowMultiple properties "true"

Thanks In Advance

What I have tried:

using (MailMessage mm = new MailMessage(senderId, receiverId))
{

foreach (HttpPostedFile uploadedFile in imgUpload.PostedFiles)
{
string FileName = Path.GetFileName(uploadedFile.FileName);
mm.Attachments.Add(new Attachment(uploadedFile.InputStream, FileName));
}
}