how to make drop down list c#?

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SQL-Server-2005

SQL-Server

how can i read data from data base as a drop down list using combobox?
Example
hi every body how are you need a help from u
1. how can i fetch data in my combo box alphabetically? I'm using c#2008 and sq l server 2005
example:
there are data in my kk data base with a table name gg having column name
user_name and user_id
user_id has data:
abebe
chala
beki
dd
alem
bako
and soon i need this data to be displayed in my combo box liken this
when start to type 'A' in my combo box it must fetch data beginning with 'a' like this
abebe
alem


2. please help me by showing how to connect data base dynamically using c# classes with sq l database. any good and free reference is highly required
thank u for u'r help
please show me all the necessary steps for the question
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