类型转换的问题

Question

String title=Convert.ToString(cmd.ExecuteScalar());
如何转化为数值类型？

Answer 1

Convert.ToInt32(SqlCmd.ExecuteScalar());

Answer 2

int title=Convert.ToInt32(cmd.ExecuteScalar());

Answer 3

(int)title=Convert.ToInt32(cmd.ExecuteScalar());

Answer 4

int title=(int)cmd.ExecuteScalar();

Answer 5

int title=Convert.ToInt32(cmd.ExecuteScalar());
int title = int.Parse(cmd.ExecuteScalar().ToString());