textbox loses value on post back

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i have about 4 textboxes on my webpage...some are asp:textboxes while others are input type="text".

the input textbox is populated through a javascript popup calender control while asp.net textbox is populated by typing...initial values of these textboxes are retrived from a databese. when a user changes these values, they are not saved and the textboxes are cleared out after the submit button is clicked...please help resolve this confusion...thanks..

using session in that webpage