I have wrote such BAT file:
@echo off
set scriptDir=%~dp0
set synchronizerDir="C:\GPSM\Synchronizer"
rmdir /s /q %synchronizerDir%
xcopy "%scriptDir%Synchronizer" %synchronizerDir% /c /d /i /y /e
start "%synchronizerDir%\Synchronizer.exe"
In last code row I run my EXE file (console .NET application). But it ain’t working. I get such screen:

But if I run my EXE manually – it works. Where my mistake? How can I run it through BAT?
You can write this piece of code to close command:-