insert data in SQL SERVER database in ASP.NET

//.cd file

 SqlConnection con = new           SqlConnection(ConfigurationManager.ConnectionStrings["str"].ConnectionString);

 SqlCommand cmd;

cmd = new SqlCommand("insert into student values(@fnames,@lname)", con);

        cmd.CommandType = CommandType.Text;

        cmd.Parameters.AddWithValue("@fnames", "some values");

        cmd.Parameters.AddWithValue("@lname", "some values");

        con.Open();

        cmd.ExecuteNonQuery();

        con.Close();