ASP.NET custom server control not retaining values after post back

I have a custom server control (composite control having dynamically created dropdown boxes and textboxes). I 开发者_开发百科have enabled AJAX in order to avoid page reload.The server control is used inside the ASP.NET webcontrol having few buttons which controls the visibility of the server control. Now I enter values in the dropdown box and texboxes and click on any other button. After this postback the last entered values are gone! The control is not remembering the values. Can anyone help me? How can I retain the values after post back?

Ensure that the controls are given the exact same ID after each postback. Also you might want to try initialising your dynamic controls (DropDownList and TextBox) during Page_Init if possible.

If your custom server control is create dynamically all the controls, then you need to recreate them on every post, and you need to create them before the Page_Load(), or else the asp.net cant know them to filled with the post data.

To solve this, if you can not create them before the Page_Load(), then you can fill them by your self with the posted data by using the Request.Form[YourCustomControl.UniqueID] for all controls.

You need to re-create on each postback, see This article