ASP.NET show modal window until submit is finished

Hi Experts,

   I have an ASP.NET with VB.NET ( Version 2010)   page .  On click of a button it is doing a little time consuming process   called   RunBehind .
    The user should not modify fields in the form  when the  process is running
   What I am looking for is

      When the RunBehind process is started  open a Modal window   ( Or when the Button is clicked)
        Close the Modal window when the Process is finished

  Can someone give me code sample for this ?

   Thanks
Sam OZAsked:
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Bob LearnedCommented:
That reads like you are looking for a Modal Popup Overlay.

Modal Popup Overlay
http://www.codeproject.com/Articles/210537/Modal-PopUp-Overlay

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