Give your applications the ability to carry out spelling checks against user input or database fields.
Solution Center - Code examples using Spelling and Spell Checking Components
 How to Spell Check Web Page Input
 How to add as-you-type spell checking to .NET Windows Forms applications

ActiveX Spelling and Spell Checking Components by ASP Spell Check

ASPSpellCheck V2.6

ASPSpellCheck provides international spellchecking for your ASP applications. It is suitable for use with W3C HTML and XHTML applications, and has a good degree of accessibility. With no ActiveX controls, Database or DLLs to install, you can be up and running in minutes. ASPSpellCheck even be used on virtual/shared hosting.