c# - Dropdown list call back not responding -

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i new in asp.net developing have webpage contains 2 dropdownlist first 1 contains static items second dropdownlist have dynamic value read database

when enabled callback = true first dropdownlist , write following code 

protected sub zr_dl_select_user_selectedindexchanged(byval sender object, byval e eventargs) handles zr_dl_select_user.selectedindexchanged     zr_btn_add.text = zr_dl_select_user.selecteditem.value     zr_tb_fullname.text = now().tostring     dim db new mssqldb     dim select_sql_stm string = "select top 1 h_id hotels u_id = @x_uid"     if(db.reader.read)        zr_dl_group.items.findbyvalue(db.readr("h_id")).selected = true     end if end sub

my page not respond changes , freez out

make autopostback property of dropdown(zr_dl_select_user) true in .aspx page , check.


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