make sure you have paid for the plan that allows asp.net hosting
and the connection strings would be provided by godaddy along with that. i remember that even i had the same issues when i first hosted on godaddy. for a reference, maybe you can try the below
<connectionStrings>
<add name="Personal" connectionString=" Server=whsql-v04.prod.mesa1.secureserver.net; Database=DB_675; User ID=user_id; Password=password; Trusted_Connection=False" providerName="System.Data.SqlClient" /> <remove name="LocalSqlServer"/> <add name="LocalSqlServer" connectionString=" Server=whsql-v04.prod.mesa1.secureserver.net; Database=DB_675; User ID=user_id; Password=password; Trusted_Connection=False" providerName="System.Data.SqlClient" />
</connectionStrings>
the above goes into you web.config file