installation - How to do the uninstall process by using UI dialog box? -

i.e. if click uninstall button in ui dialog box should process uninstall msi file. things need add wix coding , custom action need this?

there no need custom action. have include 1 of wix provided dialog sets part of installer source code.

http://wixtoolset.org/documentation/manual/v3/wixui/dialog_reference/wixui_minimal.html

your requirement can met making use of wixui_minimal dialog set.

for example of how include built in dialog set installer, please see following url:

http://wixtoolset.org/documentation/manual/v3/wixui/wixui_dialog_library.html

hope helps.