[2005] folderbrowserdialog ..how to handle "close" or "cancel" button

[lplover2k]

dim mypath as string=""
With FolderBrowserDialog1
            .SelectedPath = My.Settings.defaultdir
            .ShowNewFolderButton = False
            .Description = "Choose your folder"
            .ShowDialog()
            If Len(.SelectedPath) Then mypath= .SelectedPath
 End With
 
if mypath="" then exit sub
 
'rest of code here

i use that code to let users to select a folder.... with default directory shown when dialog is opened... but when i click on "close" or "cancel" in folderdialog....it still acts as if i selected a folder...(i.e. it continues....in the section of code).... i want it to exit sub when users pres "close" or "cancel"