c# - how access connectionstring in a web.config in other project from a WCF -


i'm having difficulty access connectionstrings in web.config wcf "web services"

cenario: solution inside visual studio 2010 2 web projects, placement , wcfplacement. web.config has connectionstings inside placement project.

enter image description here

the wcfplacement not have web.config can see in picture, when build it, generates one.

from placement project can access connection strings using configurationmanager.connectionstrings["xx"].connectionstring; - ok.

but if i'm inside service, gives me error when try access, forcing me have connection string declared inside each class want database access, , that's not good.

how can access connectionstrings in th web.config inside placement project wcf ?

i tried:

sqlconnection conn = new sqlconnection(configurationmanager.connectionstrings["webv"].connectionstring);

but gives me error: system.nullreferenceexception: object reference not set instance of object. @ wcfplacement.prospect.dologin(string login, string senha)

tried inside class:

system.configuration.configuration rootwebconfig =             system.web.configuration.webconfigurationmanager.openwebconfiguration("/placement");             system.configuration.connectionstringsettings connstring;             if (rootwebconfig.connectionstrings.connectionstrings.count > 0)             {                 connstring =                     rootwebconfig.connectionstrings.connectionstrings["northwindconnectionstring"];                 if (connstring != null)                     console.writeline("northwind connection string = \"{0}\"",                         connstring.connectionstring);                 else                     console.writeline("no northwind connection string");             }

but error. error 1 type or namespace name 'configuration' not exist in namespace 'system.web' (are missing assembly reference?)

you have add reference system.configuration namespace.

https://msdn.microsoft.com/en-us/library/system.configuration(v=vs.110).aspx


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