using Spire.Pdf;
using Spire.Pdf.General.Find;
using Spire.Pdf.Graphics;
using System.Drawing;

namespace AddLineNumber
{
    class Program
    {
        static void Main(string[] args)
        {
     //Create a PdfDocument object
     PdfDocument doc = new PdfDocument();

     //Load PDF document
     doc.LoadFromFile(@"C:\Users\Administrator\Desktop\input.pdf");

     //Get the first page
     PdfPageBase page = doc.Pages[0];

     //Find specified text in the first line
     PdfTextFinder finder = new PdfTextFinder(page);
     finder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord;
     PdfTextFragment topLine = finder.Find("C# (pronounced See Sharp)")[0];

     //Get line height
     float lineHeight = topLine.Bounds[0].Height;

     //Get a Y coordinate for the starting position of line numbers
     float y = topLine.Bounds[0].Location.Y - 2;

     //Find specified text in the second line
     PdfTextFinder secondfinder = new PdfTextFinder(page);
     secondfinder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord;
     PdfTextFragment secondLine = secondfinder.Find("language. C#")[0];

     //Calculate line spacing
     float lineSpacing = secondLine.Bounds[0].Top - topLine.Bounds[0].Bottom;

     //Find specified text in the last line
     PdfTextFinder bottomfinder = new PdfTextFinder(page);
     bottomfinder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord;
     PdfTextFragment bottomLine = bottomfinder.Find("allocation of objects")[0];

     //Get the bottom Y coordinate of the last line, which is the height of the line number area
     float height = bottomLine.Bounds[0].Bottom;

     //Create a font with the same size as the text in the PDF
     PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 11f);

     int i = 1;
     while (y < height)
     {
         //Draw line numbers at the beginning of each line
         page.Canvas.DrawString(i.ToString(), font, PdfBrushes.Black, new PointF(15, y));
         y += lineHeight + lineSpacing;
         i++;
     }

     //Save the document
     doc.SaveToFile("result.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.General.Find
Imports Spire.Pdf.Graphics
Imports System.Drawing
 
Namespace AddLineNumber
    Class Program
        Shared  Sub Main(ByVal args() As String)
        'Create a PdfDocument object
        Dim doc As New PdfDocument()

        'Load PDF document
        doc.LoadFromFile("C:\Users\Administrator\Desktop\input.pdf")

        'Get the first page
        Dim page As PdfPageBase = doc.Pages(0)

        'Find specified text in the first line
        Dim finder As New PdfTextFinder(page)
        finder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord
        Dim topLine As PdfTextFragment = finder.Find("C# (pronounced See Sharp)")(0)

        'Get line height
        Dim lineHeight As Single = topLine.Bounds(0).Height

        'Get a Y coordinate for the starting position of line numbers
        Dim y As Single = topLine.Bounds(0).Location.Y - 2

        'Find specified text in the second line
        Dim secondfinder As New PdfTextFinder(page)
        secondfinder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord
        Dim secondLine As PdfTextFragment = secondfinder.Find("language. C#")(0)

        'Calculate line spacing
        Dim lineSpacing As Single = secondLine.Bounds(0).Top - topLine.Bounds(0).Bottom

        'Find specified text in the last line
        Dim bottomfinder As New PdfTextFinder(page)
        bottomfinder.Options.Parameter = Spire.Pdf.Texts.TextFindParameter.WholeWord
        Dim bottomLine As PdfTextFragment = bottomfinder.Find("allocation of objects")(0)

        'Get the bottom Y coordinate of the last line, which is the height of the line number area
        Dim height As Single = bottomLine.Bounds(0).Bottom

        'Create a font with the same size as the text in the PDF
        Dim font As PdfFont = New PdfFont(PdfFontFamily.TimesRoman, 11.0F)

        Dim i As Integer = 1
        While y < height
            'Draw line numbers at the beginning of each line
            page.Canvas.DrawString(i.ToString(), font, PdfBrushes.Black, New PointF(15, y))
            y += lineHeight + lineSpacing
            i += 1
        End While

        'Save the document
        doc.SaveToFile("result.pdf")

        End Sub
    End Class
End Namespace

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
using Spire.Doc.Formatting.Revisions;
using System;

namespace GetWordDifferences
    {
    class Program
    {
        static void Main(string[] args)

        {
            //Load the first Word document
            Document doc1 = new Document();
            doc1.LoadFromFile("Sample1.docx");

            //Load the second Word document
            Document doc2 = new Document();
            doc2.LoadFromFile("Sample2.docx");

            //Compare the two Word documents
            doc1.Compare(doc2, "Author");

            foreach (Section sec in doc1.Sections)
            {
                foreach (DocumentObject docItem in sec.Body.ChildObjects)
                {
                    if (docItem is Paragraph)
{
                        Paragraph para = docItem as Paragraph;
                        if (para.IsInsertRevision)
                        { 
                            EditRevision insRevison = para.InsertRevision;
                            EditRevisionType insType = insRevison.Type; 
                            string insAuthor = insRevison.Author; 
                            DateTime insDateTime = insRevison.DateTime; 
                        }

                        else if (para.IsDeleteRevision)
                        { 
                            EditRevision delRevison = para.DeleteRevision; 
                            EditRevisionType delType = delRevison.Type; 
                            string delAuthor = delRevison.Author; 
                            DateTime delDateTime = delRevison.DateTime; 
                        }

                        foreach (ParagraphBase paraItem in para.ChildObjects)
                        {
                            if (paraItem.IsInsertRevision)
                            { 
                                EditRevision insRevison = paraItem.InsertRevision; 
                                EditRevisionType insType = insRevison.Type; 
                                string insAuthor = insRevison.Author; 
                                DateTime insDateTime = insRevison.DateTime; 
                            }

                            else if (paraItem.IsDeleteRevision)
                            { 
                                EditRevision delRevison = paraItem.DeleteRevision; 
                                EditRevisionType delType = delRevison.Type; 
                                string delAuthor = delRevison.Author; 
                                DateTime delDateTime = delRevison.DateTime; 
                            }

                        }
                    }
                }
            }

            //Get the difference about revisions
            DifferRevisions differRevisions = new DifferRevisions(doc1);
            var insetRevisionsList = differRevisions.InsertRevisions;
            var deletRevisionsList = differRevisions.DeleteRevisions;      
        }
    }
 }

Imports Spire.Doc
Imports Spire.Doc.Documents
Imports Spire.Doc.Fields
Imports Spire.Doc.Formatting.Revisions
Imports System

Namespace GetWordDifferences
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)
            'Load the first Word document
            Dim doc1 As Document = New Document
            doc1.LoadFromFile("Sample1.docx")
            'Load the second Word document
            Dim doc2 As Document = New Document
            doc2.LoadFromFile("Sample2.docx")
            'Compare the two Word documents
            doc1.Compare(doc2, "Author")
            For Each sec As Section In doc1.Sections
                For Each docItem As DocumentObject In sec.Body.ChildObjects
                    If (TypeOf docItem Is Paragraph) Then
                        Dim para As Paragraph = CType(docItem,Paragraph)
                        If para.IsInsertRevision Then
                            Dim insRevison As EditRevision = para.InsertRevision
                            Dim insType As EditRevisionType = insRevison.Type
                            Dim insAuthor As String = insRevison.Author
                            Dim insDateTime As DateTime = insRevison.DateTime
                        ElseIf para.IsDeleteRevision Then
                            Dim delRevison As EditRevision = para.DeleteRevision
                            Dim delType As EditRevisionType = delRevison.Type
                            Dim delAuthor As String = delRevison.Author
                            Dim delDateTime As DateTime = delRevison.DateTime
                        End If
                        
                        For Each paraItem As ParagraphBase In para.ChildObjects
                            If paraItem.IsInsertRevision Then
                                Dim insRevison As EditRevision = paraItem.InsertRevision
                                Dim insType As EditRevisionType = insRevison.Type
                                Dim insAuthor As String = insRevison.Author
                                Dim insDateTime As DateTime = insRevison.DateTime
                            ElseIf paraItem.IsDeleteRevision Then
                                Dim delRevison As EditRevision = paraItem.DeleteRevision
                                Dim delType As EditRevisionType = delRevison.Type
                                Dim delAuthor As String = delRevison.Author
                                Dim delDateTime As DateTime = delRevison.DateTime
                            End If
                            
                        Next
                    End If
                    
                Next
            Next
            'Get the difference about revisions
            Dim differRevisions As DifferRevisions = New DifferRevisions(doc1)
            Dim insetRevisionsList = differRevisions.InsertRevisions
            Dim deletRevisionsList = differRevisions.DeleteRevisions
        End Sub
    End Class
End Namespace

import com.spire.pdf.*;
import com.spire.pdf.graphics.layer.*;

public class invisibleAllPdfLayers {
    public static void main(String[] args) {
        //Load the sample document
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("layerSample.pdf");

        for (int i = 0; i < doc.getLayers().getCount(); i++)
        {
            //Show all the Pdf layers
            //doc.getLayers().get(i).setVisibility(PdfVisibility.On);
            //Set all the Pdf layers invisible
            doc.getLayers().get(i).setVisibility(PdfVisibility.Off);
        }

        //Save to document to file
        doc.saveToFile("output/invisibleAllPdfLayers.pdf", FileFormat.PDF);
    }
}

import com.spire.pdf.*;
import com.spire.pdf.graphics.layer.*;

public class invisibleParticularPdfLayers {
    public static void main(String[] args) {
        //Load the sample document
        PdfDocument doc = new PdfDocument();
        doc.loadFromFile("layerSample.pdf");

        //Hide the first layer by index
        doc.getLayers().get(0).setVisibility(PdfVisibility.Off);

        //Hide the layer by name with blue line1
        for (int i = 0; i < doc.getLayers().getCount(); i++)
        {
            if("blue line1".equals(doc.getLayers().get(i).getName())){
                doc.getLayers().get(i).setVisibility(PdfVisibility.Off);
            }
        }

        //Save to document to file
        doc.saveToFile("output/invisiblePaticularPdfLayers.pdf", FileFormat.PDF);
    }
}