If you add a Connect timeout=120 to this string, your connection will try for 120

seconds to get opened and then aborts.

​

Data Source=.;Initial Catalog=TestDB;Trusted_Connection=true;Asynchronous Processing=true;Connection Timeout=120;

For each command, you can also specify a timeout - ADO.NET will wait for that

amount of time before cancelling out your query. 

You specify that on the sqlCommand object:

​

using(SqlCommand RetriveOrderCommand = new sqlCommand())

{

    RetrieveOrderCommand.CommandTimeout = 150;

}