Here's one: (check out http://hongouru.blogspot.ie/2011/09/c-ocr-optical-character-recognition.html or http://www.codeproject.com/Articles/41709/How-To-Use-Office-2007-OCR-Using-C for more info)
using MODI;
static void Main(string[] args)
{
DocumentClass myDoc = new DocumentClass();
myDoc.Create(@"theDocumentName.tiff"); //we work with the .tiff extension
myDoc.OCR(MiLANGUAGES.miLANG_ENGLISH, true, true);
foreach (Image anImage in myDoc.Images)
{
Console.WriteLine(anImage.Layout.Text); //here we cout to the console.
}
}