Get all values of a NameValueCollection to a string

I have the following code:

string Keys = string.Join(",",FormValues.AllKeys);

I was trying to play around with the get:

string Values = string.Join(",", FormValues.AllKeys.GetValue());

But of course that doesn't work.

I need something similar to get all the values, but I don't seem to find the appropriate code to do the same.

P.S: I do not want to use a foreach loop since that beats the purpose of the first line of code.