.net - Second press required on cancel button -

i have dialogbox cancel button called follows:

 dim dlgsizselection new dlgtyresizeselection(objcarwebvehicle.tyres, objcarwebvehicle)                  if (dlgsizselection.showdialog) = windows.forms.dialogresult.ok                     selectedtyre = ctype(dlgsizselection.lsttyreoptions.selecteditem, carwebvehiclecom.tyredata)                     dlgsizselection.close()                 elseif (dlgsizselection.showdialog) = windows.forms.dialogresult.cancel                     dlgsizselection.close()                     exit sub                 else                     msgbox("no tyre sizes selected.", msgboxstyle.exclamation, "tyre search")                     dlgsizselection.close()                     exit sub                 end if 

however, when set dialogreturn property in form calling follows:

dialogresult = windows.forms.dialogresult.cancel 

and press cancel button, flashes briefly dialog box reappears have pressed nothing , in order close have press second time.

what missing?

first of all: don't call close after modal dialog returns. modal dialog closes automatically.

you code problematic following reason: you're calling showdialog more once. if code determines ok wasn't clicked, shows dialog again, waiting user click again.

if (dlgsizselection.showdialog) = windows.forms.dialogresult.ok     ...  elseif (dlgsizselection.showdialog) = windows.forms.dialogresult.cancel     ... end if 

declare local variable holds result of single call showdialog , things work fine:

dim result windows.forms.dialogresult = dlgsizselection.showdialog  if (result = windows.forms.dialogresult.ok)   .... elseif (result = windows.format.dialogresult.cancel)   .... else   .... end if 

don't call close , no need exit sub.