C# SQL SELECT


string constr = "Data Source=*****;Initial Catalog=*****;Integrated Security=True";

string str_select = "SELECT * FROM LAN_IP";

SqlConnection con = new SqlConnection(constr);
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter(str_select, con);

da.Fill(ds,"LAN_IP");
DataTable datable = ds.Tables["LAN_IP"];
textBox1.Text= datable.Rows[1][4].ToString();