isInRole doesn't work for one user, but works for everyone else

[petersonrj]

I have an ASP.NET/C# application in which I verify that the current user is a
member of a list of roles before giving them access to particular functions
of the application (read vs update). I am using the IsInRole method of the
IPrincipal object to check for role membership. Currently, I am just
checking the domain/username against a list of domain/usernames, and will
eventually created Groups.

This is working well for all users, except one. Although my application is
correctly identifying this user with the correct domain/username, the
isinrole call returns false.

My code is below:

from the .aspx.cs:

private void Page_Load(object sender, System.EventArgs e)
{
if (!((Security)(Application["security"])).userInRole("edit",
HttpContext.Current.User))
edit = false;
else
edit = true;


}

This code is from a C# object (called "Security") and is called from the
page above:


public Boolean userInRole(String role, IPrincipal principal)
{
Boolean inRole = false;

AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);

//get users from hashtable
String[] users = (String[])securityRolesMap[role];

//loop through users to see is the current user matches

for(int i=0;i< users.Length;i++)
{
String user = users;
if (principal.IsInRole(users.ToLower()))
{
inRole = true;
break;
}
}

return inRole;

}


Any ideas why this would work okay for everyone except one user?