XOR Encryptor

I am trying how simple XOR works and try out some control.

.exe:http://www.mediafire.com/file/miymdntmyj2/XOR Encryption.exe

Source:http://www.mediafire.com/file/miymdntmyj2/XOR Encryption.exe

bug existed:
-character with even times of occurence will not be encryted, because of the System::String Replace function which replace all the character specified in the string.
#Possible solution,break into string array and XOR one string by one string.