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Using Word's spellchecker in C#

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4.44 (23 votes)
17 Jul 2003CPOL
An article on using Word's spellchecker from a textbox in C#

Image 1


This little function written in C# will invoke Microsoft Word's spellchecker and check the spelling of a given textbox.


I had written a program in C# in which a spellchecker could be useful. Since I had a hard time finding any information on the net or in the MSDN Library for .NET, on how to use Word's spellchecker from a C# application I was wondering if it was because it was a trivial affair to program, something only a few people would use or because it was actual difficult to program. I decided to dig deeper into it. A VBA script that I found on the net convinced me that it would be possible to find a solution. The following article in MSDN "AutoWord Sample: Demonstrates Automating Microsoft Word" pointed in the right direction and from there it was straight forward.

Using the code

Remember to reference the Microsoft Word xx Object Library. (Interop.Word.dll) There are so many properties and functions for the document object that if you want to use a similar logic for a RichTextBox it should be fairly simple.

using Word;
using System.Reflection;


private void button1_Click(object sender, System.EventArgs e) 
    fSpellCheck(textBox1 , label1 ); 
public void fSpellCheck(TextBox tBox, Label lLbl) 
    int iErrorCount = 0; 
    Word.Application app = new Word.Application(); 
    if (tBox.Text.Length > 0) 
        // Setting these variables is comparable
        // to passing null to the function. 
        // This is necessary because the C# null
        // cannot be passed by reference. 
        object template=Missing.Value; 
        object newTemplate=Missing.Value; 
        object documentType=Missing.Value; 
        object visible=true; 
        object optional = Missing.Value; 
        _Document doc = app.Documents.Add(ref template, 
           ref newTemplate, ref documentType, ref visible); 
        doc.Words.First.InsertBefore (tBox.Text ); 
        Word.ProofreadingErrors we = doc.SpellingErrors; 
        iErrorCount = we.Count; 
        doc.CheckSpelling( ref optional, ref optional, ref optional, 
            ref optional, ref optional, ref optional, ref optional, 
            ref optional, ref optional, ref optional, 
            ref optional, ref optional); 
        if (iErrorCount == 0) 
            lLbl.Text = "Spelling OK. No errors corrected "; 
        else if (iErrorCount == 1) 
            lLbl.Text = "Spelling OK. 1 error corrected "; 
            lLbl.Text = "Spelling OK. " + iErrorCount + 
                                    " errors corrected "; 
        object first=0; 
        object last=doc.Characters.Count -1; 
        tBox.Text = doc.Range(ref first, ref last).Text; 
        lLbl.Text = "Textbox is empty"; 
    object saveChanges = false; 
    object originalFormat = Missing.Value; 
    object routeDocument = Missing.Value; 
    app.Quit(ref saveChanges, ref originalFormat, ref routeDocument); 


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Web Developer
Canada Canada
Working as a software developer - currently workflow management tools - and enjoying every minute of it.

Comments and Discussions

GeneralThe screen splash after spellcheck completed Pin
quangvinh19-Oct-05 1:02
memberquangvinh19-Oct-05 1:02 
GeneralRe: The screen splash after spellcheck completed Pin
gugaime15-Aug-06 19:20
membergugaime15-Aug-06 19:20 
GeneralRe: The screen splash after spellcheck completed Pin
shahbaz rehman15-Apr-08 3:01
membershahbaz rehman15-Apr-08 3:01 
Generalspell check for website Pin
sb785-Jul-05 11:40
membersb785-Jul-05 11:40 
GeneralRe: spell check for website Pin
nyland6-Jul-05 6:47
membernyland6-Jul-05 6:47 
GeneralRe: spell check for website Pin
sb786-Jul-05 10:18
membersb786-Jul-05 10:18 
GeneralRe: spell check for website Pin
anit10-Jul-05 13:08
memberanit10-Jul-05 13:08 
GeneralCreating a Custom Spell-Checker with Word 2003 Pin
Wagner DosAnjos23-Mar-05 9:47
memberWagner DosAnjos23-Mar-05 9:47 
GeneralEULA Pin
Kant18-Jul-03 8:17
memberKant18-Jul-03 8:17 
GeneralRe: EULA Pin
Rei Miyasaka11-Nov-04 11:33
memberRei Miyasaka11-Nov-04 11:33 
GeneralRe: EULA Pin
CSpotkill13-Nov-04 21:36
memberCSpotkill13-Nov-04 21:36 
GeneralRe: EULA Pin
James S. Taylor5-Jun-07 12:44
memberJames S. Taylor5-Jun-07 12:44 

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Posted 17 Jul 2003


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