erp/SiteCore/GetCaptchaImage.cs

using System.Web;
using System.Web.SessionState;
using Utils;
using Utils.ImageUtils;

namespace SiteCore.Handler
{
    public class GetCaptchaImage : BaseHandler, IHttpHandler, IRequiresSessionState
    {
        public void ProcessRequest(HttpContext context)
        {
            CommonHelper.PageExpires();
            ValidateCode vc = new ValidateCode(80, 25);
            vc.CreateImage();
        }
    }
}