Dim FileExten As String = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName)
Select Case FileExten.ToUpper
Case ".DOC"
Response.Write(FileExten.ToUpper)
Case ".ZIP"
Response.Write(FileExten.ToUpper)
Case ".XLS"
Response.Write(FileExten.ToUpper)
Case Else
Response.Write("都不是")
End Select
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