gistfile1.cs

public ExchangeRepository()
        {
            serviceInstance = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

            //Provide the  account user credentials
            serviceInstance.Credentials = new WebCredentials(ConfigurationManager.AppSettings["User"].ToString(),
                ConfigurationManager.AppSettings["Password"].ToString(),
                ConfigurationManager.AppSettings["Domain"].ToString());

            try
            {
                // Use Autodiscover to set the URL endpoint.
                serviceInstance.AutodiscoverUrl(ConfigurationManager.AppSettings["MailBox"].ToString());
            }
            catch (Exception ex)
            {
                serviceInstance = null;
                ExceptionMessage = ex.Message;
            }

        }