The application attempted to perform an operation not allowed by the security policy

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)   
            {     
                // Reference the SpecifyRolesStep WizardStep 
                WizardStep SpecifyRolesStep = CreateUserWizardStep1.FindControl("SpecifyRolesStep") as WizardStep; 
                // Reference the RoleList CheckBoxList 
                CheckBoxList RoleList = SpecifyRolesStep.FindControl("RoleList") as CheckBoxList; 
                // Bind the set of roles to RoleList         
                RoleList.DataSource = System.Web.Security.Roles.GetAllRoles();  
                RoleList.DataBind(); 
            } 
        }
       
 
        protected void RegisterUser_CreatedUser(object sender, EventArgs e)
        {
            TextBox UserNameTextBox = (TextBox)CreateUserWizardStep1.ContentTemplateContainer.FindControl("UserName");
            SqlDataSource DataSource = (SqlDataSource)CreateUserWizardStep1.ContentTemplateContainer.FindControl("InsertExtraInfo");
 
            MembershipUser User = Membership.GetUser(UserNameTextBox.Text);
           
 
            object UserGUID = User.ProviderUserKey;
 
            DataSource.InsertParameters.Add("Userid", UserGUID.ToString());
            DataSource.Insert();
        }
 
        [PrincipalPermission(SecurityAction.Demand, Role = "Administrators")] 
        protected void RegisterUser_ActiveStepChanged(object sender, EventArgs e) 
        {      // Have we JUST reached the Complete step?     
            if (CreateUserWizard1.ActiveStep.Title == "Complete") 
            {          
                // Reference the SpecifyRolesStep WizardStep  
                WizardStep SpecifyRolesStep = CreateUserWizardStep1.FindControl("SpecifyRolesStep") as WizardStep; 
                // Reference the RoleList CheckBoxList   
                CheckBoxList RoleList = SpecifyRolesStep.FindControl("RoleList") as CheckBoxList;    
                // Add the checked roles to the just-added user  
                foreach (ListItem li in RoleList.Items) 
                {
                    if (li.Selected)
                        System.Web.Security.Roles.AddUserToRole(CreateUserWizard1.UserName, li.Text); 
                } 
            }
        }

                                              

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