Why? Lines of code is a pretty useless metric - is it worth counting a block start:
if (condition)
{
variable = value;
}
Is that one line of code? Or two? Or four? Do comments count - they should do, because they are an investment in the future maintainability of the software. Or they shouldn't, because they don't add anything to the "user experience".
If you must, then it is pretty simple to write your own: Use File.ReadAllLines to return the content in line by line form, and then discard blank lines. Recurse through your solution folder, and you are there.
About half an hour to write and test, at a guess. In addition, you can apply your own metrics to the questions above.