Convert DOC (Word 97-2003) to DOCX format using C# and .NET

  1. Add SautinSoft.Document from Nuget.
  2. Load an input document.
  3. Save to a DOCX format.

Document .Net can help your application to convert a document from a one format to another.
You'll need only to Load() a document and Save() to a desired format:


            DocumentCore dc = DocumentCore.Load(inpFile);
            dc.Save(outFile);

Document .Net supports these formats:

PDF DOCX RTF HTML Text Image
Create/Read/Write Create/Read/Write Create/Read/Write Create/Read/Write Create/Read/Write Create/Read(OCR)/Write

Complete code

using System.IO;
using SautinSoft.Document;

namespace Example
{
    class Program
    {
        static void Main(string[] args)
        {
            // Get your free 30-day key here:   
            // https://sautinsoft.com/start-for-free/

            ConvertFromFile();
            ConvertFromStream();
        }

        /// <summary>
        /// Convert DOC (Word 97-2003) to DOCX (file to file).
        /// </summary>
		/// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-doc-word-97-2003-to-docx-in-csharp-vb.php
        /// </remarks>
        static void ConvertFromFile()
        {
            string inpFile = @"..\..\..\example.doc";
            string outFile = @"Result.docx";

            DocumentCore dc = DocumentCore.Load(inpFile);
            dc.Save(outFile);

            // Open the result for demonstration purposes.
            System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
        }

        /// <summary>
        /// Convert DOC (Word 97-2003) to DOCX (using Stream).
        /// </summary>
		/// <remarks>
        /// Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-doc-word-97-2003-to-docx-in-csharp-vb.php
        /// </remarks>
        static void ConvertFromStream()
        {

            // We need files only for demonstration purposes.
            // The conversion process will be done completely in memory.
            string inpFile = @"..\..\..\example.doc";
            string outFile = @"ResultStream.docx";
            byte[] inpData = File.ReadAllBytes(inpFile);
            byte[] outData = null;

            using (MemoryStream msInp = new MemoryStream(inpData))
            {

                // Load a document.
                DocumentCore dc = DocumentCore.Load(msInp, new DocLoadOptions());

                // Save the document to DOCX format.
                using (MemoryStream outMs = new MemoryStream())
                {
                    dc.Save(outMs, new DocxSaveOptions() );
                    outData = outMs.ToArray();                    
                }
                // Show the result for demonstration purposes.
                if (outData != null)
                {
                    File.WriteAllBytes(outFile, outData);
                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
                }
            }
        }
    }
}

Download

Imports System
Imports System.IO
Imports SautinSoft.Document

Module Sample
    Sub Main()
        ConvertFromFile()
        ConvertFromStream()
    End Sub
        ''' Get your free 30-day key here:   
        ''' https://sautinsoft.com/start-for-free/
	''' <summary>
	''' Convert DOC (Word 97-2003) to DOCX (file to file).
	''' </summary>
	''' <remarks>
	''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-doc-word-97-2003-to-docx-in-csharp-vb.php
	''' </remarks>
	Sub ConvertFromFile()
		Dim inpFile As String = "..\..\..\example.doc"
		Dim outFile As String = "Result.docx"

		Dim dc As DocumentCore = DocumentCore.Load(inpFile)
		dc.Save(outFile)

		' Open the result for demonstration purposes.
		System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
	End Sub

	''' <summary>
	''' Convert DOC (Word 97-2003) to DOCX (using Stream).
	''' </summary>
	''' <remarks>
	''' Details: https://sautinsoft.com/products/document/help/net/developer-guide/convert-doc-word-97-2003-to-docx-in-csharp-vb.php
	''' </remarks>
	Sub ConvertFromStream()

		' We need files only for demonstration purposes.
		' The conversion process will be done completely in memory.
		Dim inpFile As String = "..\..\..\example.doc"
		Dim outFile As String = "ResultStream.docx"
		Dim inpData() As Byte = File.ReadAllBytes(inpFile)
		Dim outData() As Byte = Nothing

		Using msInp As New MemoryStream(inpData)

			' Load a document.
			Dim dc As DocumentCore = DocumentCore.Load(msInp, New DocLoadOptions())

			' Save the document to DOCX format.
			Using outMs As New MemoryStream()
				dc.Save(outMs, New DocxSaveOptions())
				outData = outMs.ToArray()
			End Using
			' Show the result for demonstration purposes.
			If outData IsNot Nothing Then
				File.WriteAllBytes(outFile, outData)
				System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
			End If
		End Using
	End Sub
End Module

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Questions and suggestions from you are always welcome!

We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.