Folder name to combobox in VB.NET -

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i wanted combo box fill in runtime checking directory name in directory.

here code :

    private sub editform_load(sender object, e eventargs) handles mybase.load         call clear()     end sub  private sub clear()         qtytb.enabled = false         parttb.clear()         qtytb.clear()         dtcb.items.clear()         mthcb.selectedindex = ""         yrcb.selectedindex = ""         radiobutton2.checked = true         radiobutton1.checked = true         textbox1.clear()         textbox2.clear()    >>     dim di new directoryinfo("d:\database\" & pick_item.deptlbl.text)        if di.exists = true             each subdirectory directoryinfo in di.getdirectories()                 yrcb.items.add(cint(subdirectory.name.tostring))             next         end if<<      end sub

that complete code combobox , load form when debug, appear messagebox error dont know error in code

"conversion "" string integer not valid"

this picture of directory thing this. so, how can add folder name combobox? directories name using integer (cause name year), if add directories name(not integer) can. appreciated

your problem in top line

dim folders() string = io.directory.getdirectories("d:\database\")   each folder string in folders     combobox1.items.add(folder)   next

update

is there other code present in subroutine/event not included above? tried , works fine if folder names numbers

enter image description here

i think problem in these lines

mthcb.selectedindex = "" yrcb.selectedindex = ""

change them 

mthcb.selectedindex = -1 yrcb.selectedindex = -1

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