after login how to display employee records as per user department?

in my database having three tables

1) Empoyee Master

2) Login Master

3) Department Master 

in login and department master have column for Department id is DeptID but in employee master has name of Department.

exp.

Employee Master

Emp Name         Emp Salary     Emp Department

XYZ                    10,000              Account                                ETC.

Login Master

USER NAME        PASSWORD      DEPTID

QPR                    123                         121

ASD                    110                        120

Department Master

Department Name        DEPTID

ACCOUNT                      121

HR                                    120

now i want to display only account related data when user login in system...

on employee page only data should be display relevant department

using asp.net web application......

how to do this please help me to solve this.....