Asp。Net按钮在UpdatePanel内的中继器中单击事件

I am trying to use a Repeater inside a Updatepanel and have Buttons that delete one entery in the Database and get the new Data for the Repeater and Update the Panel. I have tried a LinkButton, but it does always postback and the page relodes. Then i tried a regular Button and create a Event for that Button on DataBound Event. But it doesnt work. Here is the code:I am trying to use a Repeater inside a Updatepa