Word Processing API for .NET

using DevExpress.Office.Utils;
using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;

// Load the first document
using var firstDocStream = new MemoryStream(File.ReadAllBytes("Document1.docx"));
using var wordProcessor = new RichEditDocumentServer();
wordProcessor.LoadDocument(firstDocStream, DocumentFormat.Docx);
Document document = wordProcessor.Document;

// Merge the second document into the first
document.AppendSection().StartType = SectionStartType.NextPage;
using var secondDocStream = new MemoryStream(File.ReadAllBytes("Document2.docx"));
document.AppendDocumentContent(secondDocStream, DocumentFormat.Docx);

// Configure page layout for all sections
foreach (Section section in document.Sections)
{
    section.Page.PaperKind = DevExpress.Drawing.Printing.DXPaperKind.Letter;
    section.Page.Landscape = false;
    section.Margins.Left = Units.InchesToDocumentsF(1f);
    section.Margins.Right = Units.InchesToDocumentsF(1f);
}

// Update built-in document properties and save the merged result
document.DocumentProperties.Creator = "DevExpress";
document.DocumentProperties.Title = "Merged Report";
using var outputStream = new MemoryStream();
wordProcessor.SaveDocument(outputStream, DocumentFormat.Docx);

using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;
using System.Drawing;
using System.Text.RegularExpressions;

using var inputStream = new MemoryStream(File.ReadAllBytes("Document.docx"));
using var wordProcessor = new RichEditDocumentServer();
wordProcessor.LoadDocument(inputStream, DocumentFormat.Docx);
Document document = wordProcessor.Document;

// Find and replace a keyword
document.ReplaceAll("COMPANY_NAME", "Doe Corp", SearchOptions.WholeWord);

// Find and highlight all occurrences of a specific term
DocumentRange[] placeholders = document.FindAll("Confidential", SearchOptions.None);
foreach (DocumentRange placeholder in placeholders)
{
    CharacterProperties cp = document.BeginUpdateCharacters(placeholder);
    cp.Bold = true;
    cp.ForeColor = Color.DarkRed;
    document.EndUpdateCharacters(cp);
}

// Find and remove private information (email addresses) using regex
Regex emailPattern = new Regex(@"\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b",
    RegexOptions.IgnoreCase);
DocumentRange[] ranges = document.FindAll(emailPattern);
for (int i = ranges.Length - 1; i >= 0; i--)
    document.Delete(ranges[i]);

using var outputStream = new MemoryStream();
wordProcessor.SaveDocument(outputStream, DocumentFormat.Docx);

using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;

using var inputStream = new MemoryStream(File.ReadAllBytes("Document.docx"));
using var wordProcessor = new RichEditDocumentServer();
wordProcessor.LoadDocument(inputStream, DocumentFormat.Docx);
Document document = wordProcessor.Document;

// Grant editing permissions to specific users/groups
RangePermissionCollection rangePermissions = document.BeginUpdateRangePermissions();
DocumentRange editableRange = document.Paragraphs[0].Range;
RangePermission rp = rangePermissions.CreateRangePermission(editableRange);
rp.Group = "Everyone";
rangePermissions.Add(rp);
document.EndUpdateRangePermissions(rangePermissions);

// Apply read-only protection with a password
document.Protect("readonly_password", DocumentProtectionType.ReadOnly);

// Save as a password-encrypted file
EncryptionSettings encryptionSettings = new EncryptionSettings();
encryptionSettings.Type = EncryptionType.Strong;
encryptionSettings.Password = "encryption_password";

using var outputStream = new MemoryStream();
wordProcessor.SaveDocument(outputStream, DocumentFormat.Docx, encryptionSettings);

using DevExpress.XtraRichEdit;
using DevExpress.XtraRichEdit.API.Native;

// Load the original document
using var originalDocStream = new MemoryStream(File.ReadAllBytes("Document_Original.docx"));
using var original = new RichEditDocumentServer();
original.LoadDocument(originalDocStream, DocumentFormat.Docx);

// Load the revised document
using var revisedDocStream = new MemoryStream(File.ReadAllBytes("Document_Revised.docx"));
using var revised = new RichEditDocumentServer();
revised.LoadDocument(revisedDocStream, DocumentFormat.Docx);

// Configure comparison options
CompareDocumentOptions options = new CompareDocumentOptions();
options.ComparisonLevel = ComparisonLevel.Word;
options.CompareFormatting = true;
options.CompareCaseChanges = true;
options.Author = "Jane Doe";

// Compare documents with options
Document comparisonResult = original.Document.Compare(revised.Document, options);

using var outputStream = new MemoryStream();
comparisonResult.SaveDocument(outputStream, DocumentFormat.Docx);

using DevExpress.Office.Services;
using DevExpress.XtraSpreadsheet.Services;
using DevExpress.XtraRichEdit.API.Native;
using DevExpress.Spreadsheet.Charts;
using DevExpress.Spreadsheet;
using System.Drawing;

OfficeCharts.Instance.ActivateCrossPlatformCharts();

using var wordProcessor = new RichEditDocumentServer();
Document document = wordProcessor.Document;
document.Unit = DevExpress.Office.DocumentUnit.Inch;

// Insert a clustered column chart
Shape chartShape = document.Shapes.InsertChart(document.Range.End,
    DevExpress.XtraRichEdit.API.Native.ChartType.ColumnClustered);
chartShape.AltText = "Quarterly Sales Chart";
chartShape.Size = new SizeF(6f, 3.5f);

// Populate the chart with sample quarterly data
ChartObject chart = (ChartObject)chartShape.ChartFormat.Chart;
Worksheet worksheet = (Worksheet)chartShape.ChartFormat.Worksheet;
worksheet["B2"].Value = "Quarter";
worksheet["C2"].Value = "Revenue ($K)";
worksheet["D2"].Value = "Units Sold";
worksheet["B3"].Value = "Q1"; worksheet["C3"].Value = 420; worksheet["D3"].Value = 210;
worksheet["B4"].Value = "Q2"; worksheet["C4"].Value = 580; worksheet["D4"].Value = 295;
worksheet["B5"].Value = "Q3"; worksheet["C5"].Value = 670; worksheet["D5"].Value = 340;
worksheet["B6"].Value = "Q4"; worksheet["C6"].Value = 830; worksheet["D6"].Value = 415;
chart.SelectData(worksheet["B2:D6"]);
chart.Title.SetValue("2025 Quarterly Performance");

using var outputStream = new MemoryStream();
wordProcessor.SaveDocument(outputStream, DocumentFormat.Docx);