Web.config ConnectionString settings for asp.net 2.0

it should be 10 minute change , but i did spent 2 hours to change this.

web.config
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CodeBehind
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System.Configuration;
System.web.Configuration;

string connectionString=
System.Web.Configuration.WebConfigurationManager.ConnectionStrings["connectionstring"].ConnectionString;
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to make this work we need to add System.Configuration.dll , this is not in system.dll


we can encrypt connection string ,
you can go through this ..

http://msdn.microsoft.com/en-us/magazine/cc163849.aspx#S2


-venkat.