You can distinguish an integer before char, so the "automatic" translation will be as follows:
inputString = inputString.Replace(, ((char) 34).ToString(), "")
In this case, the characters that are mapped to 34 (according to ASCII) ", so you can just build a double-quoted string char:
inputString = inputString.Replace(, "\"", "")
It will also improve readability, as it is now clear what you are doing in this part: you are removing double quotes.