How to bind RadImageGalery from code behind

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C#

ASP.NET

Ajax

Telerik

hi,
i have same picture in my folder whene i try to bind my imgagalery it dosen't work (whene i put the code i button) but whene i make the same code in page loade it work
i'm using script manager and update panelt in my web form and this is my code

RadImageGallery1.ImagesFolderPath = "~/Template/Image/";

plz i need help very quickly and thanks