FileStream stream=new FileStream (file, FileMode. Open, FileAccess. Read); 
BinaryReader br=new BinaryReader (stream); 
Char [] byt=new char [2]; 
Byt [0]=br. ReadChar (); 
Byt [1]=br. ReadChar ();//read 1 byte, throw an exception: output character buffer is too small, unable to contain the decoding of characters! 

//...