How to apply the graphics transformations for particular object in PDF document ?

C#:
//Create a new pdf document
PdfDocument document = new PdfDocument();
 
//Add the page
PdfPage page = document.Pages.Add();
 
//Save the current graphics states
PdfGraphicsState state = page.Graphics.Save();

//Translate the coordinate system’s to where you want to draw the text position
page.Graphics.TranslateTransform(100, 100);
 
//Rotate the coordinate system’s
page.Graphics.RotateTransform(90);
 
//Draw the string at the origin
page.Graphics.DrawString("Text rotation", new PdfStandardFont(PdfFontFamily.Courier,20), PdfBrushes.DarkBlue, new PointF(0, 0));
 
//Restore the graphics state
page.Graphics.Restore(state);
 
//Save and close the document
document.Save("Output.pdf");
document.Close(true);