How to set Tesseract 2 to read a SINGLE char in C#?

Im writing a simple OCR in C# and im using tesseract 2.0 In my program i will recognize ONLY capital letters. For this reason im using: ``` Tesseract ocr = new Tesseract(); ocr.SetVariable("tessedit_char_whitelist", "ABCDEFGHIJKLMNOPQRSTUVWXYZ"); ``` So at this point i will pass an image of a single capital letter. It works quit good but sometimes it returns to me a string with TWO letters. ``` Input: R Output: FE ``` Now i need to know how to set the page segmentation mode to "single character." to improve the results. Anyone knows how to do this in C# with tesseract 2? Becouse in the Tesseract ocr object i have only the SetVariable Methods. In iOS apis there is this method to do this: ``` setPageSegMode(TessBaseAPI.PSM_SINGLE_CHAR); ``` Anyone can help me?