vb.net - How to enumerate folders in a directory and populate a ComboBox using VB -

i new vb.net programmer using visual studio 2015.

i need enumerate set of folders in path , use folder names populate combobox can select folder application.

the folders have identifier such -

\folder1.kma \folder2.kma \folder3.kma \folder4.kma

i want folders .kma extension used populate combobox. other folders ignored.

how locate folders? how use results populate combobox?

   dim di new directoryinfo("c:/")    dim diar fileinfo() = di.getfiles("*kma")    dim dra fileinfo         each dra in diar            combobox1.items.add(dra)         next 

this gets .kma files in "c:/" folder.