Read connection string from web.config

How can i read connection string from web.config file in to a public class in class library. i've tried

WebConfigurationManager

ConfigurationManager

but these are not recognized in class library

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Add System.Configuration as a reference.

For some bizarre reason it's not included by default.

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您需要添加对System.Configuration的引用，然后使用：

System.Configuration.ConfigurationManager.
    ConnectionStrings["connectionStringName"].ConnectionString;

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C#

// Add a using directive at the top of your code file    
using System.Configuration;

// Within the code body set your variable    
string cs = ConfigurationManager.ConnectionStrings["connectionStringName"].ConnectionString;

VB

' Add an Imports statement at the top of your code file    
Imports System.Configuration

' Within the code body set your variable    
Dim cs as String = ConfigurationManager.ConnectionStrings("connectionStringName").ConnectionString

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