how to create roles in web.config ..

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security

authentication

hi...

i want to know how can i define roles in web config .

i have a logintable (name,password,userrole) and userrole is of three types (admin,teacher,student).... and my website have three folder according to my role ...

now i have written something like below in web.config...

<pre lang="HTML">

<location path="Admin">
    <system.web>
      <authorization>
        <allow roles="Admin" />
        <deny roles="*" />
      </authorization>
    </system.web>
  </location>
  <location path="Teacher">
    <system.web>
      <authorization>
        <allow  roles="Teacher" />
        <deny roles="*" />
      </authorization>
    </system.web>
  </location>
 <location path="Student">
    <system.web>
      <authorization>
        <allow  roles="Student" />
        <deny roles="*" />
      </authorization>
    </system.web>
  </location>

and in login page i have code like below ....

if (Roles.IsUserInRole("Admin"))
       {
           Response.Redirect("~/Admin/Default.aspx");
       }
       if (Roles.IsUserInRole("Teacher"))
       {
           Response.Redirect("~/Teacher/Default.aspx");
       }
if (Roles.IsUserInRole("Student"))
       {
           Response.Redirect("~/Student/Default.aspx");
       }

but my code does not execute any of above condition...Please help me and tell me how can i manage my roles in login page to web config page ..

can i create role in web config then please tell me how ...

please help me .....