Unless you have a specific reason, the spellchecker.aspx file that comes with the sample files should always be used.You will find the spellcheck.aspx file within the samples that came with the RichTextBox installer.

Use the appropriate file depending on the .NET Framework version running on your server.

Installed directory: \RichTextBox v2.0\SpellCheck\ASP.NET v1.0

Installed directory: \RichTextBox v2.0\SpellCheck\ASP.NET v1.1 

RichTextBox will automatically “Out of the box” look for the spellchecker.aspx file at the top of your web apps directory or virtual directory.

e.g.

     http://localhost/myapp/spellchecker.aspx

     C:\Inetpub\wwwroot\myapp\spellchecker.aspx

If your application is within a virtual directory, it may look like this

C:\workspace\myapp\spellchecker.aspx

If you wish, or need to place the spellchecker.aspx file in a different location, there are two ways to set up RichTextBox to find the file.

1: Use the RichTextBox SpellCheckerUrl Property on the page (or within the code) containing the RichTextBox control.

e.g.

<script runat="server">

    private void Page_Load(object sender, System.EventArgs e)

    {

            myRTB.SpellCheckerUrl = “/myapp/newDirectory/spellcheck.aspx";

    }

</script>

OR

<RTB:RICHTEXTBOX id="myRTB" runat="server" SpellCheckerUrl=“/myapp/newDirectory/spellcheck.aspx"></RTB:RICHTEXTBOX>

2: Globally across the app within the web.config file

            e.g.

            <appSettings>

                        <add key="RichTextBoxSpellCheckerUrl" value="/myapp/newDirectory/spellcheck.aspx"/>