The ConnectionString property has not been initialized.

The ConnectionString property has not been initialized.

????

:D

it is sooo easy. but you can waste a lot of time on this one.

Here is what was my problem:
1.) web.config:

< appSettings >
< add key="aaa" value="server=swoosh\sqlserver2k5;database=swdb;uid=sa;password=;" />
< / appSettings >

2.) accessing:
string strConnRSS = System.Configuration.ConfigurationManager.AppSettings["bbb"];

yes.
aaa <> bbb

Hope this'll help someone :)
don't look for anything too complicated :)