C# File Reading Fails

The following chunk of code "should work":

            string[] FilesToRead = { @"C:\mycode\datafiles\foo.txt" };

            int FileCount = FilesToRead.Length;
           
            for (int fPtr = 0; fPtr < FileCount; fPtr++)
            {
                string nextFile = FilesToRead[fPtr];

                bool b = File.Exists(nextFile);

                string[] lines = System.IO.File.ReadAllLines((nextFile);

            }

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The folder and file is there on my C drive.  However,  I get a file not found exception.  I am on a Windows 10 Pro machine and using VS2013.

Is System.IO broken?