Vuyiswamb:

when the textchange is fired , i need that grid to show me records, but it seems there is something wrong there , because i need to manualy click somewhere else

Yes. that is because TextChanged event (when AutoPostBack=true) is something doesnt fire when you type in anything in the textbox (like keypress/up/down); TextChanged event will fire when focus lost from the textbox. so, when you click somewhere else or you press tab after typeing in the textbox - the focus get lost from the textbox and then only the textchanged event get fired and binding the grid..