remove white space and blank line from lines of comma text file

foreach (string line in File.ReadAllLines("C:\\TESTDATA.txt"))
                {

                    string line1;
                    line1 = line.Replace("\t", "");
                    line1 = line.Replace("\r", "");
                    line1 = line.Trim();
                    line1 = line.Replace(" ", "");
                }

That's not quite right. Each operation takes the original string ("line"), does the

Replace operation and assigns it to a different string ("line1"). Each operation replaces

the contents of line1, so the effects of the previous assignments to line1 are lost.

It should be more like this:

foreach (string line in File.ReadAllLines("C:\\TESTDATA.txt"))
{
    
    string line1;
    line1 = line.Replace("\t", "");
    line1 = line1.Replace("\r", "");
    line1 = line1.Trim();
    line1 = line1.Replace(" ", "");
}

- Wayne