wpf mediaelement error with external storage

[Everplay]

I am using Mediaelement in my WPF application . I insert external storage while debugging and want to play a video file from the external storage but I can not but when I Redebug the application i can play. how can i play the file without redebug ,please help me.

Private Sub BrowseFile()
If openfile.ShowDialog = True Then
Try
My.Settings.Path = openfile.FileName
txt_name.Content = openfile.FileName
Catch ex As Exception

End Try
mediaelement.Position = New TimeSpan(0)
slider_due.Value = 0
End If
End Sub

If My.Settings.Path = "" Then
Else
Try
mediaelement.Source = New Uri(My.Settings.Path)
Catch ex As Exception

End Try
End If




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