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Using Word's spellchecker in C#

, 17 Jul 2003 CPOL
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An article on using Word's spellchecker from a textbox in C#


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

GeneralThanks, this was plug and play... PinmemberJohn Ritchie16-Sep-14 12:01 
Questionhey this algorithm will make it work better because it checks for canceling and gives the number or errors corrected! ;) [modified] Pinprofessionalbgsjust24-Aug-13 4:43 
QuestionIs it possible to have multiple dictionarys ? Pinprofessionalbgsjust24-Aug-13 1:45 
QuestionError in Source code Pinmemberhardiktrivedihart2-Aug-13 7:22 
GeneralMy vote of 4 PinmemberAmsath ali26-Apr-11 20:08 
Generalis there a updated version of libraries Pinmembermahesh152925-May-10 4:22 
QuestionAdd/Remove entries from default dictionary? Pinmemberdadada71119-May-10 0:23 
GeneralWord cannot save this file because it is already open elsewhere PinmemberMember 361523317-Aug-09 3:12 
GeneralUse the Open Office Spell Checker from .NET and get no licence problems [modified] PinmemberThomas Maierhofer21-Jul-09 2:24 
GeneralRe: Use the Open Office Spell Checker from .NET and get no licence problems PinmemberRealSkydiver13-Nov-09 1:43 
GeneralRe: Use the Open Office Spell Checker from .NET and get no licence problems [modified] PinmemberThomas Maierhofer14-Nov-09 3:50 
Generalcount is missleading on the number of errors actually corrected Pinmemberwleon14-Nov-08 7:13 
QuestionHang? Pinmemberkikytan20-Apr-08 22:07 
AnswerRe: Hang? Pinmembermnevis2-Jul-08 7:29 
GeneralRe: Hang? Pinmemberdavidc@innosphere.ca6-Aug-08 5:40 
AnswerRe: Hang? Pinmemberfelchaal28-Aug-08 9:44 
GeneralRe: Hang? Pinmemberpronning30024-Aug-10 1:41 
Generalspell-checking service Pinmemberhnipak19-Oct-06 4:56 
GeneralMore than just the count Pinmemberroutsoja5-Jun-06 8:32 
Generalspell check for website without it's dialog Pinmemberhala_ref3at3-May-06 12:18 
Questionhow to have rtf style in richtextbox? Pinmemberhduani7-Nov-05 3:02 
GeneralThe screen splash after spellcheck completed Pinmemberquangvinh19-Oct-05 2:02 
GeneralRe: The screen splash after spellcheck completed Pinmembergugaime15-Aug-06 20:20 
GeneralRe: The screen splash after spellcheck completed Pinmembershahbaz rehman15-Apr-08 4:01 
Generalspell check for website Pinmembersb785-Jul-05 12:40 

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