In this step you'll add some content to the document using the DrawString method.
In the MainPage.xaml.cs file immediately following the new C1PdfDocument object you created in step 1, add the following code:
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
{
// Add content to the page
Rect rc = pdf.PageRectangle;
rc.X = rc.Y = 72;
Font font = new Font("Arial", 12);
pdf.DrawString("Hello World!", font, Colors.Black, rc);