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disable postback on a button

Posted By:      Posted Date: September 01, 2010    Points: 0   Category :ASP.Net
Hey guys, I'm pretty new to asp.net and having some troubles.   I have a button whose sole purpose is to set  div.visible = true There is a calendar control on my page and I need the selected date to remain selected after I hit this button. Right now if I hit the button it refreshes the whole page and sets the calendar's selected day back to date. today   Any ideas?  

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