怎么删除iis和重装iis_iis未将对象引用设置到对象的实例

<system.web>
      <httpRuntime enableVersionHeader="false"/>
    ...

protected void Application_Start()
{
    MvcHandler.DisableMvcResponseHeader = true;
}

namespace Project.Infrastructure.Web.Modules.Http
{
    public class CustomHeaderModule : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.PreSendRequestHeaders += OnPreSendRequestHeaders;
        }

        public void Dispose() { }

        void OnPreSendRequestHeaders(object sender, EventArgs e)
        {
         //HttpContext.Current.Response.Headers.Remove("Server");
            // 你可以在此设置
        HttpContext.Current.Response.Headers.Set("Server", "CERN httpd");
        }
    }
}

<system.webServer>
    <modules>
    <add name="CustomHeaderModule" type="StrongNamespace.HttpModules.CustomHeaderModule" />