Entity Framework connection string issue

I am using EF connection string in my project,and it doesnt work. i will post my code and can anyone tell me how to rebuild debug.appconfig and relase.appconfig bcuz i have an error to
Attachment 163079

Here is my connection string code :

Code:

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    <add name="dentnedEntities" connectionString="data source=DESKTOP-Q8526KR\SQLEXPRESS;Integrated Security=SSPI;
                      database=dentned;
                      AttachDBFilename=|DataDirectory|dentned.mdf;
                      User Instance=true"
    providerName="System.Data.SqlClient" />

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I have create another one and it doesnt work here is the 2nd code :

Code:

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<add name="dentnedEntities" connectionString="metadata=res://*/Entity.Model_dentned.csdl|res://*/Entity.Model_dentned.ssdl|res://*/Entity.Model_dentned.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=DESKTOP-Q8526KR\SQLEXPRESS;initial catalog=dentned;Integrated Security=true; MultipleActiveResultSets=True;App=EntityFramework&quot;" />

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delete that second one... it's jsut too wrong to fix. The first one... I don't know how you managed to mangle that one... but you've managed to mix two connection types there. First thing you need to decide is if you're connecting to a database on a SQL Server instance, or if you're wanting to connect to a database file... once you decide that, you then need to delete the parts that are for the other connection type. If you need help pop over to https://www.connectionstrings.com/sqlconnection/ for a properly formatted connection string.

-tg