Getting Null value on parameter in querystring parameter

Question

in my application i have send one link to User's email id he can download software on clicking this link....now my url is look like.... http://www.abc.co.in/Download.aspx?period=11/04/2013%2012:29:20%20PM&ProductName=Otja and my code for retriving this value on pageload download.aspx page is

    string PName = Request.QueryString["ProductName"] as string;



    string myDate = Request.QueryString["period"];
    if (!String.IsNullOrEmpty(myDate))
    {
        myDate = myDate.Replace("!", ":");
    }
    DateTime dt1 = Convert.ToDateTime(myDate);
    DateTime dt2 = DateTime.Now;
    TimeSpan variable = dt2 - dt1;
    if (variable.TotalMinutes > 5)
    {
        //Response.Write("Download time is expired now");
        lblmsg.Visible = true;
        lblmsg.Text = "Download time is expired now";
    }
    else
    {

        lblmsg.Visible = true;
        lblmsg.Text = "U can Still Download";
    }

but this is not working i tested and before 5 Minute and after minutes it is only shows "You can still download" so i think my error is that i can not retrive that productname and period value on querystring on this download.aspx page..please help me.. thanks i think there should be error..... String was not recognized as a valid DateTime. thats why it is pass null value so any solution ???

Bhushan Bhangale · Accepted Answer · 2013-04-12 04:43:12Z

1

You said you think that your code is not able to retrieve the query params. Why don't you confirm that by printing the values first.

The Request.QueryString() looks correct.

There could be issue with your logic which may case the else to execute.

Based on more information provided by you please try this -

Variable myDate value must be “11-04-2013 06 36”. Please confirm.

Instead of Convert.ToDateTime(myDate); try this

DateTime.ParseExact(myDate, "dd-MM-yyyy HH:mm", System.Globalization.CultureInfo.InvariantCulture);

edited Apr 12, 2013 at 4:43

answered Apr 11, 2013 at 7:12

Bhushan Bhangale

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8 Comments

purvang pandya Over a year ago

actully sir i tested this make code response.redirect("download.aspx,false) on that page where i have pass this url and make code for send mail and putting debugger on download.aspx and after checking i saw both the querystring pass null value ..

Bhushan Bhangale Over a year ago

In your comment the download.aspx url does not have any parameters.

purvang pandya Over a year ago

that is the reasion sir if i put parameters then its working but i can not do this thing because after click of submit button on inquiry page that url is send autometically to user's mail account and download process is start so i can not redirect user to that download page so i can not pass that code i have just pass for testing

purvang pandya Over a year ago

i have to find another way to retrive this value ....my logic is working because i checked after puting parametes on response.redirect its all working fine....but this is not requirement of my code

purvang pandya Over a year ago

i think there should be error..... String was not recognized as a valid DateTime. thats why it is pass null value so any solution ???

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