How to create a timer which is working during a reservation process in asp.net ?

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I have a website for reserving hotel rooms. I want to put a 30 mins timer for this process . I mean while the customer is filling the information of reserve in MULTIPLE PAGES , I have a timer to show how much time is remained that he allowed to finish the reservation. I want to know if its possible and how ?
thanks in advance

Posted 18-May-15 0:21am

marimir

Updated 18-May-15 0:25am

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F-ES Sitecore · Accepted Answer · 2015-05-18T00:41:00

When the process starts, store the expiry time in the session

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (Session["Expiry"] == null)
    {
        Session["Expiry"] = DateTime.Now.AddMinutes(30);
    }
}

The use some javascript to show a countdown on each page

Countdown timer in asp.net[^]

Rather than hard-coding the interval you get the minutes left from the date stored in the session

var min = <%=(((DateTime)Session["Expiry"])  - DateTime.Now).Minutes %>;