which connection string i want to use?

Question

Dear all,

 

 

i have developed a website using asp.net sql express 2008 r2  with entity freme work

 

now i have problem  in web.config i have a connection string and one more in app.comfig

 

please tell which connection string i want to use 

 

my connection string like bellow 

 

<add name="GatewayEntities" connectionString="server=.\sqlexpress;database=Gateway_Two;Integrated Security=True;" /> 

 

<add name="GatewayEntities" connectionString="metadata=res://*/Gatewaydb.csdl|res://*/Gatewaydb.ssdl|res://*/Gatewaydb.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=.\sqlexpress;initial catalog=Gateway_Two;user id=sa;password=123;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient"/> 

 

above both which connection string i want to use please suggest me