I am using TortoiseHG for source code control in Windows, I forgot to edit the ".hgignor" file, and now I have a huge folder ".hg" which I know it's because of DLL and EXE and PDB files which I do not need them. Now changing the ignor file does not remove those files.
What should I do for deleting these files completely from my TortoiseHg data source?
You can use the hg remove command to remove files in your repository. If you are using TortoiseHG, you can right click on the file and go: TortoiseHG -> Remove File.
Check out the "How to stop tracking a file" section Here.