What Is Web.Config For Database Connectivity In Asp.Net

Web.config through Database Connectivity in asp.net

web.config
---------------
add some lines in web.config..

<connectionStrings>
    <add name="webconfconnection" connectionString ="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;User Instance=true;Integrated Security=true;" providerName="System.Data.SqlClient"/>
   </connectionStrings>

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