print page in wpf as print report , how i can call this in button click

private void Print(Visual v)
       {

           FrameworkElement e = v as FrameworkElement;
           if (e == null)
               return;

           PrintDialog pd = new PrintDialog();
           if (pd.ShowDialog() == true)
           {
               //store original scale
               Transform originalScale = e.LayoutTransform;
               //get selected printer capabilities
               var capabilities = pd.PrintQueue.GetPrintCapabilities(pd.PrintTicket);

               //get scale of the print wrt to screen of WPF visual
               double scale = Math.Min(capabilities.PageImageableArea.ExtentWidth / e.ActualWidth, capabilities.PageImageableArea.ExtentHeight /
                              e.ActualHeight);

               //Transform the Visual to scale
               e.LayoutTransform = new ScaleTransform(scale, scale);

               //get the size of the printer page
               Size sz = new Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);

               //update the layout of the visual to the printer page size.
               e.Measure(sz);
               e.Arrange(new Rect(new Point(capabilities.PageImageableArea.OriginWidth, capabilities.PageImageableArea.OriginHeight), sz));

               //now print the visual to printer to fit on the one page.
               pd.PrintVisual(v, "My Print");

               //apply the original transform.
               e.LayoutTransform = originalScale;
           }
       }