Showing Uploading progress on post back

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C#

ASP.NET

i am developing an intranet.
In that,am binding a gridview with some datas,in that gridview one field is a template filed containg LinkButton
there are some pdf files uploaded in the server under the data binded first in the grid.
when clicking on the likn button,another gridview is binding with the details fo the pdf files uploaded,say file path of the pdf
and there is another linkbutton on outer of the gridview,to download all the pdf regarding the data on the first gridview.
on downloading,its creating a zip file to join all that pdf files(there are more than one pdf )


All the above is functioning properly,

but when clicking on any of the LINKBUTTOn in the page is showing uploding progress in the borwser(google chrome)
like this uploading(1%)..............................uploading(100%) after that the function regarding that button is happening,so that there is a bid delay for each operations.

i dont know whats the problem,if you have any idea,help me.

if you didnt understand the question,please tell me i will explain more