MVC 3, C#.Net 4.0: How will I create captcha in Razor cshtml5 ?

I am working with MVC 3 C#.Net 4.0 web applications. I need to implement captcha image text in my login page.

Please help me.
chrisdtrinityphysiciansAsked:
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chrisdtrinityphysiciansAuthor Commented:
I am trying to use the URL: http://www.dotnetcurry.com/ShowArticle.aspx?ID=611

But, I can't add microsof-web-helper namespace. Will I need to install any service pack for that?

I am very new to this area?
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