i develop a web page in the way that at runtime i generate a instance of calender
control and add that control to the page and i also attach a event called DayRender dynamically
to the calender control and  in the DayRender event i add checkbox to the all the cell of calender control
at runtime when i checked the check box inside the cell of calender control and press button then after
postback the all checkboxes are going to be uncheck.i could not understand the problem that why the
webpage losing its state.that is why please help me some one that how could write the code in such a way
that after postback the state of the page will be persistent as a result after postback i can read the
value of control.please help me anyone with concept and sample code.

You can maintain state across multiple request by makin a few additions to your page and control declarations

for page level add this attribute to html page declaration

<%@ Page EnableViewState="true" %>

For control level viewstate eg checkbox add

<asp:CheckBox id="chkYesNo" runat="server" EnableViewState="true" />

for further information on View State
State Management in ASP.NET

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BrainBench ADO.NET and ASP.NET Certified Developer