How to do wildcards (*.txt) in C#.net

Can anyone tell me how to use a wildcard to select all txt files in a given path?  I'm using the code shown below.  The first line, commented out, fails saying the asterik is an invalid character.  The second line appears to be fine, but causes all the rest of my code to appear invalid.  (See the screenshot for what I'm talking about.)

The code works perfectly when I use the commented out version and specify a filename, but I need a version that I can tell to grab all text files in a given directory.

 
static void Main(string[] args)
        {
            //var filePath = @"F:\groups\billing\837Pupload\*.txt";

            var filePath = Directory.GetFiles(@"F:\groups\billing\837Pupload\", "*.txt");


            File.WriteAllText(
              filePath,
              Regex.Replace(File.ReadAllText(filePath), @"~", "~\n", RegexOptions.Multiline)
              );

            File.WriteAllText(
              filePath,
              Regex.Replace(File.ReadAllText(filePath), @"HL\*(1\d+|[2-9]\d*)\*\*20\*1~(\s+.+~){6}\r?\n?", "", RegexOptions.Multiline)
              );
        }

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code.jpg
fcsITAsked:
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athomsfereCommented:
What is the exact error message you are getting?

I know I can use "*" as a wild card in directory searcher...

else if (userName.Contains(" "))
                {
                    string[] names = userName.Split(' ');
                    foreach (string N in names)

                    names[0] += "*";
                    names[1] += "*";

                    userName = names[0] + " " + names[1];

                    searchAtt = "CN";
                }

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Maybe your issue is the class does not support it?
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plusone3055Commented:
http://www.csharp-examples.net/get-files-from-directory/


string[] filePaths = Directory.GetFiles(@"c:\MyDir\", "*.txt");
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fcsITAuthor Commented:
Please see the attached screenshot for build errors.
build-errors.jpg
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fcsITAuthor Commented:
plusone3055, that's the exact code I copied and am trying.
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fcsITAuthor Commented:
plusone3055, I copied that code from that site yesterday, I already have that url, but it's failing.
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athomsfereCommented:
Does it run if you declare var as var[] instead, or even better as string[]

var[] filePath = Directory.GetFiles(@"F:\groups\billing\837Pupload\", "*.txt");

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fcsITAuthor Commented:
No.  I was hoping for the same easy trick.

I get the same build errors when using this:

string[] filePath = Directory.GetFiles(@"F:\groups\billing\837Pupload\", "*.txt");
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fcsITAuthor Commented:
It's complaining about the parameters (filepath) in each error, which is of course the code that I copied from the csharp-examples site.
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athomsfereCommented:
Are you trying to write all of the files to another text document?
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fcsITAuthor Commented:
No.  I'm scanning each file for a certain character string, then if found, removing it and the next six lines.  The files are saved over themselves, not written elsewhere.
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athomsfereCommented:
OK, maybe try doing something like this?

static void Main(string[] args)
        {

            string[] filePath = Directory.GetFiles(@"F:\groups\billing\837Pupload\", "*.txt");

            foreach (string file in filePath)
            {
            File.WriteAllText(
              file,
              Regex.Replace(File.ReadAllText(file), @"~", "~\n", RegexOptions.Multiline)
              );

            File.WriteAllText(
              file,
              Regex.Replace(File.ReadAllText(file), @"HL\*(1\d+|[2-9]\d*)\*\*20\*1~(\s+.+~){6}\r?\n?", "", RegexOptions.Multiline)
              );
            }
        }

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fcsITAuthor Commented:
You ROCK!!  That worked perfectly!  So I needed to bring apart file and filepath??  I would have never guessed that!

Awesome job, thanks so much!!!!
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athomsfereCommented:
Awesome!

Essentially the problem was that you were telling your regex to look at what should have been an array.

So once you broke it down and basically told it it to:

give me the files in directoryX as an Array

For each file found, run the Regex

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it then knew how to handle the files (Not as one giant collection all at once)

That's also why you were getting the error message about cannot convert string[] to string, C# saw that you were trying to run a method against a file (they way you called the method), but what you actually had stored was potentially dozens or hundreds of files.
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