Thanks to all. I just have resolve the problem. It was my string connection:

string connectionString = "Data Source=MYIP;Initial Catalog=MYDB;User ID=sa;Password=MYSAPASSWORD";

Thanks for your help, anyway.

I forgot to attach my sql string connection:

"Data Source=MyIPServername;Integrated Security=no;Current Language=English;User ID=MyUsername;Password=MyPassword;Initial Catalog=MyDBName;"