Remove newline from string

Why does this not work?

string x = "This is a test\r\nof the \r\nnewline character."
x = x.Replace(@"\n", "+").Replace(@"\r", "");
Watch x still equals "This is a test\r\nof the \r\nnewline character."
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string ax = "This is a test\r\nof the \r\nnewline character.";
ax = ax.Replace('\n', '+').Replace("\r", "");
System.Diagnostics.Debug.WriteLine (ax);

Will this do?
Rowdyone52Author Commented:
Still doesnt replace with "+"
string x = "This is a test\r\nof the \r\nnewline character.";
x = x.Replace("\r\n", "+");

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Well, I got the + on my string,
"This is a test+of the +newline character"
Forgot about putting it the way AlexNek, i.e. one call.

Anyway, as long as you get the solution
Why not?
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