DBIO Error: Utility 'mysqldump.exe' not found in MySQL home 'MySQL Connector/Net'
I've figured it out. Export database is working now.

I had to copy mysqldump.exe from

C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqldump.exe

to

C:\Program Files (x86)\MySQL\Connector NET 6.5.4\mysqldump.exe