Hi...
Can u try this ..
Page.ClientScript.RegisterClientScriptBlock(Page.GetType(), "test", "window.open('Homepage.aspx','maximize=true,top=0,left=0,height=1000px,width=1350px,status=no,resizable=yes,toolbar=no,menubar=no,location=yes,fullscreen=false, scrollbars=no,conductengine=no,url=no,Addressbar:disable=yes' );", true);
Thank u.