using System.Data.SqlClient; public class sqlServerConnection { public static void Main() { string cstr = "server=SERVER\\SQLEXPRESS;Initial Catalog=master;Integrated Security=SSPI"; try { using (SqlConnection con = new SqlConnection(cstr)) { con.Open(); System.Console.WriteLine("ServerVersion:{0}",con.ServerVersion); System.Console.WriteLine("State:{0}",con.State); } } catch (System.Exception sqle) { System.Console.WriteLine(sqle.Message); } } } "Server=localhost\\SQLExpress;Integrated Security=SSPI" "Server=localhost\\SQLExpress;Initial Catalog=master;Integrated Security=SSPI"