Can anyone please help me. I have problem in accessing connectionstring from web.config file to ClassLibraries

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I am working on n-tier application with separate BLL and DAL classlibraries. I have connectionstring in web.config file. And in UI i can access it but how to access in BLL and DAL. In User Interface i have two classes one which i made connectionClass as public shared function GetConnStr() as string and function return connstring thru configMgr and in other class as baseClass for connection i have two constructor call with constr as parameter and without. And property for connectionstring.
Now i can access connstr in UL but i can't access it if i am writing same baseClass in BLL and DAL. I feel I short of some step to access connstring. I have error saying "constr is not intialized"

Another problem is in property page of UI i used imported Namespaces to import connectionClass but it seems not working. How to know it is working plz help.

I would appreciate to get correct methods for coding and nice way of asking question if I am not so expressive. Plz pardon me if I am overexpressive. I am new to codeproject and new to .net. I got learning inspirsation for your website.
Thank You

Posted 8-Mar-10 2:02am

MyNameisPaul

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thatraja · Answer 1 · 2010-03-08T03:20:00

Solution 1

you can access
sample code like

C#

string strCon = "";           
strCon = System.Configuration.ConfigurationManager.AppSettings.Get("ConString");

Include using System.Configuration; in the class

Posted 8-Mar-10 3:20am

thatraja

Sandeep Mewara · Answer 2 · 2010-03-08T04:00:00

All libraries in the AppDomain have access to the web.config data through the ConfigurationManager class (using System.Configuration)

So in a class library,

string connString = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;

Use this way in order to access the connection string.