HttpContext does not contain definition of?

Question

Hi Team

 

I have similiar error

using Microsoft.Owin.Security; // Assembly i have used for my MVC web project.
private IAuthenticationManager AuthenticationManager
{
    get
    {
        return HttpContext.GetOwinContext().Authentication;  // Error is stating this object does not contain definition of GetOwninContext() for HttpContext
    }
}

// Same below with this object below;

public async Task ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl)
{
    if (User.Identity.IsAuthenticated)
    {
        return RedirectToAction("Manage");
    }

    if (ModelState.IsValid)
    {
        // Get the information about the user from the external login provider
        var info = await AuthenticationManager.GetExternalLoginInfoAsync();
        // Error state it does not have definition for GetExternalLoginInfoAsync method
        if (info == null)
        {
            return View("ExternalLoginFailure");
        }
        var user = new ApplicationUser() { UserName = model.UserName };
        var result = await UserManager.CreateAsync(user);
        if (result.Succeeded)
        {
            result = await UserManager.AddLoginAsync(user.Id, info.Login);
            if (result.Succeeded)
            {
                await SignInAsync(user, isPersistent: false);
                return RedirectToLocal(returnUrl);
            }
                }
        AddErrors(result);
    }
    ViewBag.ReturnUrl = returnUrl;
    return View(model);
}

on my methods, i have correct assemblies for both. How can i fix this issue? please help