Add marker on button click reading from database.

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Here is the sequence that I want to code. I am using ASP.NET platform VB code behind.

1) on running application map will be displayed centered at desired location  - Done

2) Click on Add Point button

3) Read lat long from database filtered using SQL query may be excel,xml or any other

4) Display selected points markers on google map

5) googlmap will adjust extent to cover displayed marker