C# File Reading Fails

Try to see if you are able to validate with exists method.

string curFile = @"c:\temp\test.txt";
Console.WriteLine(File.Exists(curFile) ? "File exists." : "File does not exist.");

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Also you can try to get fileinfo with this method. This will also give you another way if you are accessing correct or valid file.

// The name of the file.
	const string fileName = { @"C:\mycode\datafiles\foo.txt" };

// Create new FileInfo object and get the Length.
	FileInfo f = new FileInfo(fileName);
	long s1 = f.Length;

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In your junk code you can also add a condition..

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

                bool b = File.Exists(nextFile);

                if (b == True)
               {
                       string[] lines = System.IO.File.ReadAllLines((nextFile);
               }

            }

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I created a c:\temp folder in it and put a text file named text.txt.

I executed this code:
string curFile = @"c:\temp\test.txt";
Console.WriteLine(File.Exists(curFile) ? "File exists." : "File does not exist.");

And File does not exist was written to console.

Since File.Exists says no file,  getting it's length shouldn't work, no?

Check if permission issue. Try to give full read and write access to temp folder.

Next which user account .net application using..check and try give access to temp folder.

This is my local machine.  I checked permissions on the temp folder (which I created for this test) and the folder gives users:

Can you close your visual studio and try running it under elevated permissions(right click on visual studio and run as administrator) and give this code a try?

Good thought, but nope.

The icon is for text files (sometimes) in windows 10.  Here is the property of the file I am attempting to read:

What output do you get if you make the following call in the Immediate Window:

?System.IO.Directory.GetFiles(@"C:\mycode\datafiles")

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Indeed I was hiding the file extensions and that was all of it.  By doing a getfiles and looking at the return I saw the extra .txt.  I then unhide the known extensions and there they were!!!

Thanks folks!!!