Dear you should have Sql sever express to run these .
then create your database in App_code .
for your reference connection string will be -
<connectionStrings>
<add name="DatabaseConnectionString" connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=true" providerName="System.Data.SqlClient"/>
</connectionStrings>
for windows you can use this
Server=.\SQLExpress;AttachDbFilename=c:\asd\qwe\mydbfile.mdf;Database=dbname;
Trusted_Connection=Yes;