Password Reset with ASP.Net Identity

Hi everyone,

I'm trying to implement a password reset method:

protected void ResetPassword(object sender, EventArgs e)
{
    var userStore = new UserStore<IdentityUser>();
    var userManager = new UserManager<IdentityUser>(userStore);

    // Register Token Provider
    var provider = new Microsoft.Owin.Security.DataProtection.DpapiDataProtectionProvider("Account");
    userManager.UserTokenProvider = new Microsoft.AspNet.Identity.Owin.DataProtectorTokenProvider<IdentityUser>(provider.Create("PasswordReset"));

    var user = userManager.FindByName(UserName.Text);
            
    if (user != null)
    {
        string passwordResetToken = userManager.GeneratePasswordResetToken(user.Id);
        //Now what do I do with this token?

        LoginForm.Visible = false;
        LoginStatus.Visible = true;
        lblStatus.Text = "A password token has been emailed to you.";
    }
    else
    {
        lblStatus.Text = "Invalid username.";
        lblStatus.ForeColor = Color.Red;
        LoginStatus.Visible = true;
    }
}

I've been following instructions on various websites but can't figure out what I should do with the password reset token that has been generated. According to Account Confirmation and Password Recovery with ASP.NET Identity, I'm supposed to do like:

var code = await UserManager.GeneratePasswordResetTokenAsync(user.Id);
var callbackUrl = Url.Action("ResetPassword", "Account", new { UserId = user.Id, code = code }, protocol: Request.Url.Scheme);
await UserManager.SendEmailAsync(user.Id, "Reset Password", "Please reset your password by clicking here: <a href=\"" + callbackUrl + "\">link</a>"); 

My questions:

1. What does Url.Action do?

2. I was getting an error "The name 'Url' does not exist in the current context." So I added the namespace 

using System.Security.Policy;

..but now I get "System.Security.Policy.Url does not contain a definition for 'Action'.

3. How do I implement just a simple method where a temporary password is emailed to the user and she just needs to enter in the temporary password, then enter her new password?

Thanks very much.