Experience in creating dynamic controls

In the morning, I created a widget dynamically and found that:
1. When the PostBack operation is performed, repeat the dynamically created action. At this time, you can obtain the value of the previously created control. Using form, you cannot reference the controls set.
Thispage. Request. Form [controlid]
2. For controls such as Textbox, although a new value can be added during PostBack, the new value cannot be displayed in the result, but it is still the value before PostBack. The enableviewstate of the control is also disabled. It is suspected that viewstate will be restored after dynamic creation (that is, after page_load.
3. Methods for obtaining controls
Control CTL = contain. findcontrol (controlid );
If (CTL! = NULL) contain. Controls. Remove (CTL );