PdfDocumentProcessor.CreateEmptyDocument() Method

using DevExpress.Pdf;
using System;
using System.Drawing;

static void Main(string[] args)
{
    using (PdfDocumentProcessor processor = new PdfDocumentProcessor())
    {
        // Create an empty document.
        processor.CreateEmptyDocument("..\\..\\Result.pdf");

        // Create and draw PDF graphics.
        using (PdfGraphics graph = processor.CreateGraphicsPageSystem())
        {
            DrawGraphics(graph);

            // Render a page with graphics.
            processor.RenderNewPage(PdfPaperSize.Letter, graph);
        }
    }
}

static void DrawGraphics(PdfGraphics graph)
{

    // Draw text lines on the page.
    SolidBrush black = (SolidBrush)Brushes.Black;
    using (Font font1 = new Font("Times New Roman", 32, FontStyle.Bold))
    {
        graph.DrawString("PDF Document Processor", font1, black, 180, 150);
    }
    using (Font font2 = new Font("Arial", 20))
    {
        graph.DrawString("Display, Print and Export PDF Documents", font2, black, 168, 230);
    }
    using (Font font3 = new Font("Arial", 10))
    {
        graph.DrawString("The PDF Document Processor is a non-visual component " +
                            "that provides the application programming interface of the PDF Viewer.", font3, black, 16, 300);
    }
}

Imports DevExpress.Pdf
Imports System
Imports System.Drawing

Shared Sub Main(ByVal args() As String)

    Using processor As New PdfDocumentProcessor()

        ' Create an empty document.
        processor.CreateEmptyDocument("..\..\Result.pdf")

        ' Create and draw PDF graphics.
        Using graph As PdfGraphics = processor.CreateGraphicsPageSystem()
            DrawGraphics(graph)

            ' Render a page with graphics.
            processor.RenderNewPage(PdfPaperSize.Letter, graph)
        End Using
    End Using
End Sub

Private Shared Sub DrawGraphics(ByVal graph As PdfGraphics)

    ' Draw text lines on the page.
    Dim black As SolidBrush = CType(Brushes.Black, SolidBrush)
    Using font1 As New Font("Times New Roman", 32, FontStyle.Bold)
        graph.DrawString("PDF Document Processor", font1, black, 180, 150)
    End Using
    Using font2 As New Font("Arial", 20)
        graph.DrawString("Display, Print and Export PDF Documents", font2, black, 168, 230)
    End Using
    Using font3 As New Font("Arial", 10)
        graph.DrawString("The PDF Document Processor is a non-visual component " & "that provides the application programming interface of the PDF Viewer.", font3, black, 16, 300)
    End Using
End Sub

office-file-api-in-web-api-app/CS/Controllers/PdfController.cs#L48

using (PdfDocumentProcessor tempProcessor = new PdfDocumentProcessor()) {
    tempProcessor.CreateEmptyDocument();
    tempProcessor.Document.Pages.Add(processor.Document.Pages[i]);