Attributes

 System.Collections.Generic;

[AttributeUsage(AttributeTargets.Class)]
public class Permissions : Attribute
{
    public enum PermissionType
    {
        Admin,
        Consignor,
        SuperConsignor
    }

    public Permissions(PermissionType[] pPermissionTypes)
    {
        this.PermissionList = pPermissionTypes;
    }

    public PermissionType[] PermissionList { get; set; }
}

 PermissionCheckPage : Page
{
    protected override void OnPreLoad(System.EventArgs e)
    {
        base.OnPreLoad(e);
        foreach (Attribute a in this.GetType().GetCustomAttributes(true))
        {
            if (a is Permissions)
            {
                Permissions ps = a as Permissions;
                foreach (Permissions.PermissionType pt in ps.PermissionList)
                {
                    switch (pt)
                    {
                        case Permissions.PermissionType.Admin:
                            CheckPermission("IsAdmin");
                            break;
                        case Permissions.PermissionType.Consignor:
                            CheckPermission("IsConsignor");
                            break;
                        case Permissions.PermissionType.SuperConsignor:
                            CheckPermission("IsSuperConsignor");
                            break;
                        default:
                            break;
                    }
                }
            }
        }
    }
    private void CheckPermission(string input)
    {
        if (Session[input] == null)
        {
            Response.Redirect("Index.aspx");
        }
        else
        {
            if (!Convert.ToBoolean(Session[input]))
            {
                Response.Redirect("Index.aspx");
            }
        }
    }
}

 System.Collections.Generic;

[Permissions(new Permissions.PermissionType[] { Permissions.PermissionType.Admin, Permissions.PermissionType.Consignor, Permissions.PermissionType.SuperConsignor })]
public partial class Default15 : PermissionCheckPage
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
}