Do you expect any escape sequences on your line? If not, you can simply use Verbatim String Literal :
string s = @"Hello, how are you?";
Then you do not need the VS extension.
Obviously, this will only work if you are not interested in the extra spaces that will be added. If you just need to split the lines in the code, but have them on the same line in the resulting application, this will not work.
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