How Can I Avoid Download From A Link More Than Once By Copying Download Link Using C#

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how can i avoid download from a link more than once by copying download link.After downloading a pdf i can copy the download url and again download it.How to avoid this.

Posted 4-Apr-14 18:37pm

Sharon 2

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Umapathi K 5-Apr-14 0:47am

Is the user need to login to download the pdf file or any one can download the file? can you elaborate the credential here?

Sharon 2 5-Apr-14 0:59am

user login and download the pdf.after download.anyone can copy the download link and download it again.

PIEBALDconsult 5-Apr-14 1:00am

"Don't use a link" comes to mind, but I'm no Web developer.

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Er. Puneet Goel · Answer 1 · 2014-04-04T18:46:00

Solution 1

Use the session check for logged in user. If same user re-download, Show him message. Let me know if more help required

Posted 4-Apr-14 18:46pm

Er. Puneet Goel

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Sharon 2 5-Apr-14 1:02am

user login and download the pdf.after download.anyone can copy the download link if it is mozilla and download it again.

Er. Puneet Goel 5-Apr-14 1:22am

is that downloading from your own website page or somewhere else?

Sharon 2 5-Apr-14 1:30am

own site only.the process is download the pdf by clicking on linkbutton and a new pae open and download code is written there.after that a save dialog box will come download it and from browser user can copy the url and download it again as much as user want.here there is a limit of upto 4 times

Er. Puneet Goel 5-Apr-14 2:30am

ok than on that page before letting the download start, call a method that will check that if the user with the userID has download this pdf 3 times, just show a message.

Sharon 2 5-Apr-14 2:56am

then also i have to give a condition as if(remainingdownload ==0)but at that time last download wont happen.
if downloadvalue<3 cant tell like this but has to tell downloadvalue<=3 then only last download happens.

Er. Puneet Goel 5-Apr-14 3:05am

You need to have column in table with remaining count value = 2 at initialization. Ever time user download, make a decrements. Then it will be fine.

Sharon 2 5-Apr-14 3:09am

can u pls tell 1 more time i didnot understand.

Er. Puneet Goel 5-Apr-14 3:21am

Sure! take a table like UserFileDownLoadDetails. In this you have column for UserID, PdfFileID, DownloadRemaining. Now when user download the file make an entry to the table with Userid like

insert into UserFileDownLoadDetails(1, 22, 2)

Here 1 is userid, 22 is any pdf fileid and '2' is the no of time he can download the file more.

So next time he go for download, just put a check on this.

Sharon 2 5-Apr-14 3:28am

ya that i told if the condition is like downloadvalue<=2 then only last download will happen.if the condition is like downloadvalue<2 last pdf cant be downloaded.

Er. Puneet Goel 5-Apr-14 3:59am

Put check like
Check for first download by using check on rowcount for the table for userid and fileid
if count <= 0 means first time download. Make the entry to table
else
{
if(remainingDownloads != 0)
{
//Process download
//update the table entry by -1
}
else
{
//message
}
}

Sharon 2 7-Apr-14 0:54am

samething i have written sir then also i can copy the downloadlink and download it again.

Sharon 2 7-Apr-14 3:16am

ok thanks for ur reply i got it i stored it in session and made it null after download.

Er. Puneet Goel 8-Apr-14 1:58am

ok all the best.