How Can bind GridView by Some selected field Under Button Using asp.net c# web Application

Dear All,
I want to a GridView Bind By Some Previous field.

My field:
1. Date: 2014-08-06
2. Employee Name: Md Syedur Rahman(combo)
3. Customer Code: 10067(combo)
4.Customer Name: Md Syedur Rahman(Fill By Auto under Customer Code)
5. District : Rajbari(Fill By Auto under Customer Code)

Now I want to, I press Add Button,than bind in GridView by (1,2,3,4,5)field value. Again I select customer code and bind GridView by (1,2,3,4,5) field value. And Finally I Press on Save Button ,than save all data of GridView in database and clear the GridView.

N.B: Using asp.net c# Websites(Web Application). I want help for Solve this Problem.
Thanks
Md Syedur rahman