Error while Implementing "Simple Serach Panel" article

Question

Hi Friends 

I am new to Mvc. Got an error while trying to implement the article "Simple Search Panel" posted in this link.
http://www.c-sharpcorner.com/UploadFile/scottlysle/simple-search-panel-in-mvc-4/


Steps I followed:


1.Downloded the bak file & source code.
2.Completed restoring the  database into my local SQL Server instance.
3.Changed the connection string in web.config as follows.


<connectionStrings>
       <add name="PostalCodesEntities" connectionString="Data Source=.\SqlExpress;
                                                  AttachDbFilename=|DataDirectory|\PostalCodes.mdf;
                                                  integrated security=True;
                                                  MultipleActiveResultSets=True;"
                                                  providerName="System.Data.EntityClient" />
</connectionStrings>


4.Now tried running the application.Got the following error.

Server Error in '/' Application.

---

Keyword not supported: 'data source'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: Keyword not supported: 'data source'.

Source Error: 

Line 13: PostalCodesEntities context = new PostalCodesEntities();
Line 14: Line 15: return (from a in context.ZIP_Codes
Line 16: join b in context.States on a.State_Code equals b.State_Code
Line 17: orderby b.State_Code ascending, a.City, a.ZIP_Code1 ascending

Please guide me where I am doing mistake.Thanks for any kind of advice.