根据时间和取随机数 取随机数

 using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class aaa: System.Web.UI.Page
{
    Random ObjRandom = new Random();//取随机数
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    //取随机数

    protected void Button1_Click(object sender, EventArgs e)
    {
        string productID = DateTime.Now.ToString("yyyyMMddHHmm") + Convert.ToString(ObjRandom.Next(9999));

    }

或者

 

    //取随机数

    protected void Button1_Click(object sender, EventArgs e)
    {
        string productID = RulesID();

    }

    private string RulesID()
    {
        string newsid = string.Empty;
        string conststr = DateTime.Now.ToString("yyyyMMddHHmm");
        string rstr = Convert.ToString(ObjRandom.Next(9999));
        newsid = conststr + rstr;
        return newsid;
    }