Add a character on each line of a string

Question

I make a CSV converter, for this, I need to replace all the spaces with \";\". I have already did this step. The problem is that I have a texbox with the multiline mod. Here is

Answer 1

char []split = new char[]{' '};

//replaces all " " with ";", contiguous "    " will be replaced with a single ";"
var c2 = String.Join(";", content1.Split(split, StringSplitOptions.RemoveEmptyEntries)); 

//replaces all newlines with a semicolon followed by a newline, thus appends a semicolon to the end of line. 
var c3 = c2.Replace(System.Environment.NewLine, ";"+System.Environment.NewLine);

//If the file did not end with an NewLine, append a semicolon to the last line
if (!c3.EndsWith(System.Environment.NewLine)) c3+=";";

File.WriteAllText(path, c3);

It's not the fastest solution, but it works.