Retrieve data from sqlserver to dropdown list .

Question

I have entered data into textbox and stored in sql server in the page1. Now i want to retrieve that entered data into dropdown list and also when that category appears in dropdownlist , i have a textbox where i can select a category from dropdownlist and enter the data related to that category in page 2.. In page 3 , i want a gridview to display the contents in the dropdown list .... 

please help me out. i am new into .net

Thanks and regards
Antony