Hi, I aM using Aspose PDF dll to flatten My fillable pdf’s and its not working. My actual requireMent is to concatenate two pdf’s. When i aM trying to concatenate a fillable pdf with norMal pdf it is not concatenating…...WmMouseUp(Message& m, MouseButtons button, Int32 clicks)...Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase...