Dynamically hiding web parts based on current user roles

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C#

ASP.NET

WebParts

Hi How can I dynamically Hide/Show web-parts in asp.net. I am using this to doing same , but In this article they have hard coded roles on AuthorizationFilter attribute of control , instead I want roles should be assigned at runtime. I have also tried another alternate , I have declare variable 'roles' in .cs file and at runtime assigning values to roles variable( and using like AuthorizationFilter=<% #roles %> ) but it doesnt work for me as each time I am getting value for AuthorizationFilter as blank(if I am using Text=<% #roles %> on label then it displays its value but value does not assign to AuthorizationFilter). I have also tried

if (User.IsInRole("Admin"))
   Label2.Visible = true;

but it still display web part title inside web part zone.