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how will take the html controls value from source code to code behind of asp.net page

Posted By:      Posted Date: October 05, 2010    Points: 0   Category :ASP.Net

i created a calendar user control in asp.net+c#.it have two html text boxes and one img button.but i dont know ,how will take
the values to code behind of asp.net from html text boxes values at runtime on the onclick of html img button.....Any ideas????.

This is my main code


      <div>View from:</div>
         <div>  <input type="text" name="showdia" id="showdia" size="9" value="10/04/2010"><input onclick="return showCalendar('showdia', 'mm/dd/yyyy');"  type="image" src="images/cal.gif" align="absmiddle" name="reset" style="cursor:pointer"></div> 
         <div>  <input type="text" name="showdiafin" id="showdiafin" size="9" value="10/04/2010"><input onclick="return showCalendar('showdiafin', 'mm/dd/yyyy');" type="image" src="images/cal.gif" name="reset" style="cursor:pointer" align="absmiddle"></div>
    <div align="center" style="padding:3px;"> <img src="images/language/english/view.g

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