How to control access to a web form through Active Directory?

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C#

.NET

.NET4

I have the following code as part of my Page_Init Function:

#region Page Init
        protected void Page_Init(object sender, EventArgs e)
        { 
            // check if user has access (admin or user)
            if (!AppCode.Service.Security.HasAccess(Page.User.Identity.Name, new List<AppCode.Service.Enums.ADSecurityGroup> { AppCode.Service.Enums.ADSecurityGroup.APP_Tracker_Admin }))
            {
                Response.Redirect("~Error/NotAuthorized.aspx");
            }
        }
        #endregion

Being that I am on the development side of things, I have access to the web form no matter what. Because of other factors I cannot have verified members of the security group test the webform.

My question then is: Does the code above grant access to the ADSecurityGroup.APP_Tracker_Admin group? Or does it do the exact opposite?

Thank you in advance for your response.