Allow/deny user access to different web pages

See more:

C#

.NET

security

In my sql db I have permissions to allow users access to different web pages in my app. I have a page where i can dynamically change the permissions of the users during runtime. Can I allow/deny user access without using web.config?
Here's my code so far in a class:

public static int AllowUserAccess(int agentID, string formName)
        {
            SqlDataReader reader;
            int userid = 0;
            try
            {
                conn = OpenConnection();
                comm = new SqlCommand();
                comm.Connection = conn;
                comm.CommandType = CommandType.Text;
                comm.CommandText = "Select a.pkAgentID, PERM.FormName, AGP.fkAgentGroupID, agp.AllowAccess from Agents A inner join AgentGroupPermissions AGP on a.fkAgentGroupID = agp.fkAgentGroupID inner join Permission Perm ON AGP.fkPermissionID = PERM.pkPermissionID WHERE A.pkAgentID = @AgentID AND PERM.FormName = @FormName";
                comm.Parameters.Add("@AgentID", SqlDbType.Int).Value = agentID;
                comm.Parameters.Add("@FormName", SqlDbType.VarChar).Value = formName;


                reader = comm.ExecuteReader();

                if (reader.IsClosed == false)
                {
                    reader.Close();
                }

                return userid;
            }
            catch (Exception ex)
            {
                ex.Message.ToString();
                return userid;
            }
        }

In my site.master i wish to get this function and use it to authorize certain permissions once the user logs in. This is what I have so far:

protected void AllowAccess()
       {
           SqlCommand comm = new SqlCommand();
           string id = Request.Params["AgentID"];
           int agentID = Convert.ToInt32(id);
           string form = "";

           int access = DataFunctions.AllowUserAccess(agentID, form);
           bool allow = false;

           if (allow == true)
           {

           }
           else
           {
               Response.Redirect("Login.aspx");
           }
       }

I'm stuck and I do not know what else to do in regards of getting the AllowAccess value and then getting a path or to show the specific web pages for each particular user.