Disable Special characters?

Hi i am using the .NET wrapper for tesseract. I wanted to know (either inside of the wrapper or of any public function) if there is a way to disable special characters? I only need A-Z 0-9 and special characters is ALWAYS wrong which i occasionally get. -- You received this message because you ar

tesseract-ocr .NET is not thread safe

My code below gave me the exception "Attempted to read or write protected memory. This is often an indication that other memory is corrupt.". It seemed like if two threads ran this function at the same time (note ocr is on the stack and local) this exception would occur. To fix it i wrote Lock(Some