<ObsoleteAttribute("Because exact file size cannot be determined until after the file has been processed, the property has been renamed EstimatedFileSize.")>
Public ReadOnly Property FileSize As Long

Dim instance As UploadProgressEventArgs
Dim value As Long
 
value = instance.FileSize

[ObsoleteAttribute("Because exact file size cannot be determined until after the file has been processed, the property has been renamed EstimatedFileSize.")]
public long FileSize {get;}

[ObsoleteAttribute("Because exact file size cannot be determined until after the file has been processed, the property has been renamed EstimatedFileSize.")]
public:
property int64 FileSize {
   int64 get();
}