// Copyright (c) Microsoft Open Technologies, Inc.  All rights reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Resources;
using System.Security;

// General Information about an assembly is controlled through the following 
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("DocumentFormat.OpenXml")]
[assembly: AssemblyDescription("Open XML Format SDK 2.5")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("Microsoft Open Technologies, Inc.")]
[assembly: AssemblyProduct("Open XML Format SDK 2.5")]
[assembly: AssemblyCopyright("© 2014 Microsoft Open Technologies, Inc.  Licensed under the Apache License, Version 2.0.")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]

// Setting ComVisible to false makes the types in this assembly not visible 
// to COM components.  If you need to access a type in this assembly from 
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
[assembly: CLSCompliant(true)]

// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("5439c83f-c709-4487-b979-ce607e81b63e")]

// Version information for an assembly consists of the following four values:
//
//      Major Version
//      Minor Version 
//      Build Number
//      Revision
//
// You can specify all the values or you can default the Revision and Build Numbers 
// by using the ‘*‘ as shown below:
[assembly: AssemblyVersion("2.5.5893.1380")]
[assembly: AssemblyFileVersion("2.5.5893.1380")]

[assembly: NeutralResourcesLanguageAttribute("en-US")]
[assembly: AllowPartiallyTrustedCallers]
[assembly: SecurityTransparent]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using DocumentFormat.OpenXml.Spreadsheet;

namespace OpenXMLSDK_App
{
    class Program
    {
        static void Main(string[] args)
        {
            string path = args[0];
            string msg = args[1];
            CreateWordDoc(path, msg);
        }

        public static void CreateWordDoc(string filepath, string msg)
        {
            using (WordprocessingDocument doc = WordprocessingDocument.Create(filepath, WordprocessingDocumentType.Document))
            {
                // Add a main document part. 
                MainDocumentPart mainPart = doc.AddMainDocumentPart();

                // Create the document structure and add some text.
                mainPart.Document = new Document();
                Body body = mainPart.Document.AppendChild(new Body());
                Paragraph para = body.AppendChild(new Paragraph());
                DocumentFormat.OpenXml.Wordprocessing.Run run = para.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Run());

                // String msg contains the text, "Hello, Word!"
                run.AppendChild(new DocumentFormat.OpenXml.Wordprocessing.Text(msg));
            }
        }
    }
}

.\OpenXMLSDK_App.exe hello.docx "Hello, world."

<?xml version="1.0" encoding="utf-8"?>
<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main">
  <w:body>
    <w:p>
      <w:r>
        <w:t>Hello, world.</w:t>
      </w:r>
    </w:p>
  </w:body>
</w:document>

public static void CreateSpreadsheetWorkbook(string filepath)
{
    // Create a spreadsheet document by supplying the filepath.
    // By default, AutoSave = true, Editable = true, and Type = xlsx.
    SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Create(filepath, SpreadsheetDocumentType.Workbook);

    // Add a WorkbookPart to the document.
    WorkbookPart workbookpart = spreadsheetDocument.AddWorkbookPart();
    workbookpart.Workbook = new Workbook();

    // Add a WorksheetPart to the WorkbookPart.
    WorksheetPart worksheetPart = workbookpart.AddNewPart<WorksheetPart>();
    worksheetPart.Worksheet = new Worksheet(new SheetData());

    // Add Sheets to the Workbook.
    Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild<Sheets>(new Sheets());

    // Append a new worksheet and associate it with the workbook.
    Sheet sheet = new Sheet() { Id = spreadsheetDocument.WorkbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "mySheet" };
    sheets.Append(sheet);

    workbookpart.Workbook.Save();

    // Close the document.
    spreadsheetDocument.Close();
}

<?xml version="1.0" encoding="utf-8"?>
<x:workbook xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
    <x:sheets>
        <x:sheet name="mySheet" sheetId="1" r:id="Rddc7711f116045e5" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" />
    </x:sheets>
</x:workbook>