Web.config

<?xml version="1.0" encoding="utf-8"?>

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<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>
  <connectionStrings>
    <add name="connstr" connectionString="Data Source=.;Initial Catalog=CRUDTest;User Id=sa;Password=123456;"></add>
  </connectionStrings>
</configuration>