asp.net mvc - how to validate CaptchaMVC in Server side? -

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i using captchamvc in asp.net mvc project. below client side code. posting captcha action method. stuck how validate captcha in server side. captcha control in view below

<div class="form-group">     @html.hidden(mvcapplication.multipleparameterkey, 2)     @html.captcha("refresh", "", 5, "<span style='color:red'>"+generals.captchrequired+"</span>", true, new parametermodel(mvcapplication.multipleparameterkey, 2))     <label class="text-danger">@viewbag.message</label>  </div>

you have add [captchaverify("captcha not valid")] filter above on action method below

 [httppost, captchaverify("captcha not valid")]      public  actionresult index(yourmodelclass obj)               {                 if (!modelstate.isvalid)                 {                  return view("index", obj);                }            }

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