Question

I am writing a c# application. I connect to a backend SQL Server for some processing. However I hit into a weird issue today. This is my code:

static void Main(string[] args)
{
    SqlConnection con = new SqlConnection("Integrated Security=true");
    con.Open();

    SqlCommand cmd = new SqlCommand("SELECT SERVERPROPERTY('ProductVersion')", con);
    cmd.CommandType = CommandType.Text;

    SqlDataReader reader = cmd.ExecuteReader();
    reader.Read();

    Console.WriteLine(reader.GetString(0));
    Console.Read();
}

I haven’t given the server name in the Connection String, but still it connects to my local database and retrieves the required data. I am wondering how. Is the default data source set to local machine? Does “Integrated Security=true” have something to do with this?

Can someone explain this?

Thanks,
Sornakumar S

Answer 1

Looking at the docs on ConnectionString on MSDN you could find this information

To connect to a local computer, specify “(local)” for the server. If a
server name is not specified, a connection will be attempted to the
default instance on the local computer.

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring(v=vs.100).aspx