CheckBox and RadioButton controls
You can reduce postbacks and improve performance by setting the AutoPostBack property for certain controls to false. When you set a control’s AutoPostBack property to false, all events related to that control are triggered only in the processing of the next postback caused by another control in the Web Forms application.
You must surround the AutoPostBack property in a conditional compilation code block for Web Forms applications:
#IF DEFINED PBWEBFORM THEN
cbx_1.AutoPostBack = false
#END IF
