Single Login page for multiple user in c#

Question

Table fields are:

User id	user name	password	user Role
1001	Dhivya	9876	Admin
1002	RajsekaR	789	Manager
1003	Silvia	321	Employee
1004	Kamatchi	12345	Customer Care

Login page

UserId:1001

Password:****

For All user single login page
-----------------------------
if user 1001 logon then it shoul go to "Admin.aspx"
If User 1002 logon then it should open "Manager.aspx"
If User 1003 logon then it should open "Employee.aspx"
If User 1004 logon then it should open "CustomerCare.aspx"


How to do this ..Please Help Me