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How to (StartsWith) start with 4th letter?

I have a question. I want to copy specific files in 'New folder' to 'Target' folder by clicking a button. In 'New folder' contains various of file with different name. For example: "abcUCU0001", "abbUCA0003", "hhhUCU0012", "aaaUCS0012" and many more. 'New folder' contains more than 1000 files and have same 10 letters in its name. I want to copy 10 files and its name must have "UCU". I don't know how to copy using (startsWith) starting with 4th letter.
Sorry for my bad grammar.
private void button1_Click(object sender, EventArgs e)
{
string FROM_DIR = #"C:\Users\Desktop\Source";
string TO_DIR = #"C:\Users\Desktop\Target";
DirectoryInfo diCopyForm = new DirectoryInfo(FROM_DIR);
DirectoryInfo[] fiDiskfiles = diCopyForm.GetDirectories();
string filename = "UCU";
int count = 0;
foreach (DirectoryInfo newfile in fiDiskfiles)
{
try
{
if (newfile.Name=="New folder")
{
foreach (FileInfo file in newfile.GetFiles())
{
if(file.FullName.StartsWith(filename))
{
File.Copy(file.FullName, Path.Combine(TO_DIR,file.Name));
count++;
if (count == 10)
{
break;
}
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
MessageBox.Show("success");
}
I expect after click a button, 10 files with name "UCU" will copied to Target folder.

If all the files are in the same directory (no sub-directories), then you can get all files using:
//assuming diCopyForm is the new folder reference
// ? denotes 1 character while * is multiple chars
var files = diCopyForm.GetFiles("???UCU*");
And then just copy them across. For more complex criteria, I would get all the files and use LINQ to filter through.
Details about the search pattern used
If there are a lot of files in the folder then it might be more efficient to use the EnumerateFiles method
The EnumerateFiles and GetFiles methods differ as follows: When you
use EnumerateFiles, you can start enumerating the collection of names
before the whole collection is returned; when you use GetFiles, you
must wait for the whole array of names to be returned before you can
access the array. Therefore, when you are working with many files and
directories, EnumerateFiles can be more efficient.

You can check if file name has "UCU" in 4th position with string.IndexOf:
//string filename = "UCU";
if (file.FullName.IndexOf(filename) == 3)

SSIS Script to Delete and Create Folders

I have a loop that runs and creates a bunch of files per folder. The folders are uniquely named based on the order range, so they can change. And the folder must exist or the loop crashes.
I want to create a script that will delete all subfolders and files in each subfolder, from a root dir.
ie
Root = C:\Output\
SubFolder = C:\Output\T1-500\
SubFolder = C:\Output\T501-1010\
SubFolder = C:\Output\T1011-3076\
Then have it create folders as needed on the fly.
I tried:
public void Main()
{
// Deletes subfolders and files in the main folder
EmptyFolder(Dts.Variables["User::FolderName"]);
// Creates new folder on the fly
if (Directory.Exists(Dts.Variables["User::FolderName"].Value = 0))
Dts.TaskResult = Directory.CreateDirectory(Dts.Variables["User::FolderName"]);
}
private void EmptyFolder(DirectoryInfo directoryInfo)
{
foreach (FileInfo file in directoryInfo.GetFiles())
{
file.Delete();
}
foreach (DirectoryInfo subfolder in directoryInfo.GetDirectories())
{
EmptyFolder(subfolder);
}
}
It doesn't seem to pick up my package level variables, and won't let me add new ones.
I get the following when I try to use my folder variable:

The error means you are passing in the wrong data type. Try this.
Instead of this:
EmptyFolder(Dts.Variables["User::FolderName"]);
Use this:
String folderName = (string)Dts.Variables["User::FolderName"].Value;
DirectoryInfo di = new DirectoryInfo(folderName);
EmptyFolder(di);
There is probably a way to put all of it on one line but start with that.
As mentioned in comments below, the (string) cast may not be necessary if you just use the Value property - please also try that.
You will probably also need to use your new folderName string variable in other parts of your code.
As I mentioned in the comments you can also just run a command line like this to remove a folder and all subfolders
RD <yourfolder> /S /Q

Get a list of the sub folders under a directory

Ok so this is my issue currently:
This is my main:
//System prompts user the type of archiving which will direct to the correct directory to set as root
Console.WriteLine("Enter the type of archiving you would like to do?");
string archivetype = Console.ReadLine();
//function that identifies which candidates to archive
Archive(archivetype, 20, 20);
//keep the application in debug mode
Console.ReadKey();
The archive method:
//Archive method determines which directory to search in and how many versions to archive
static void Archive(string archivetype, int pversion, int version)
{
//regex pattern to get folder names of the type #.#.#.#/#. something
Regex reg = new Regex(#"\d+(\.\d+)+");
//setting where to start looking
DirectoryInfo root = new DirectoryInfo(#"C:\Users\jphillips\Desktop\test\parent\ACE-3_0");
var dirs = new List<DirectoryInfo>();
//i want to make a recursive call to all the folders in my root directory to obtain all the folders with the regex pattern above that are not empty and do not have 3 files inside
WalkDirectoryTree(root);
}
finally walk directorytree method
//so im using the walk directory tree on the microsoft website i need a way to have a sort of a global array to keep adding the directories that fit through the patterns mentioned above without resetting itself after each walkdirectorytree call
static void WalkDirectoryTree(System.IO.DirectoryInfo root)
{
DirectoryInfo[] subDirs = null;
// Now find all the subdirectories under this root directory.
subDirs = root.GetDirectories();
foreach (DirectoryInfo dir in subDirs)
{
//dirs is not global so it doesnt work here and i believe if i put a local array that it will reset itself everytime
dirs = root.GetDirectories("*", SearchOption.TopDirectoryOnly).Where(d => reg.IsMatch(d.Name)).ToList();
if()
WalkDirectoryTree(dir);
}
}
so im really lost at this point I want to able to call walkdirectorytree to go through all my folders and subfolders of my directory recursevely to extrract the paths that have the regex pattern and that are not empty and do not have 3 files inside tp give me a list of these folders paths.

You can get all the folders and subfolders in a single call with this overload of GetDirectories.
You pass in a search string - but not a regex unfortunately and SearchOption.AllDirectories as the second argument. You can then pass the results through your regex to find the ones you are interested in.

Check if file exists in folder in c#

I am moving files from source folder to destination folder. Before moving files, I am checking that directory exists or not which is working fine. The issue is with my second check where I want to make sure that folder is not empty before moving files but it is not giving me correct result.
public void MoveFilesFromTempToSourceTbl()
{
//Moving all files from temp folder to orig folder.
string sourceFolder = (twitterDO.Path + "\\" + msgDate.Year.ToString() + "\\" + msgDate.Month.ToString() + "\\" + msgDate.Day.ToString() + "_Temp").Replace("\\", #"\");
string destinationFolder = (twitterDO.Path + "\\" + msgDate.Year.ToString() + "\\" + msgDate.Month.ToString() + "\\" + msgDate.Day.ToString()).Replace("\\", #"\");
string pattern = "*.txt";
if (Directory.Exists(sourceFolder))
{
if (File.Exists(pattern))
{
foreach (var file in new DirectoryInfo(sourceFolder).GetFiles(pattern))
{
file.MoveTo(Path.Combine(destinationFolder, file.Name));
}
}
if (Directory.GetFiles(sourceFolder).Length == 0) //Before deleting make sure that Temp folder is empty.
Directory.Delete(sourceFolder, true); // Delete Temp folder after moving all the contents.
}
}
I know I am making some small mistake but not sure what it is. Following is the screenshot of the result which I got in immediate window.
http://imgur.com/FZvo9cj

There's a bit of redundancy in your current code. Starting with the if-checks, here's how I would approach this:
var sourceDirectory = new DirectoryInfo(sourceFolder); // remember this, it is reused
if (sourceDirectory.Exists)
{
// Look for the files in the directory, if none found, will be empty array
foreach (var file in sourceDirectory.GetFiles(pattern))
{
file.MoveTo(Path.Combine(destinationFolder, file.Name));
}
// Re-check the directory for any remaining files
if (sourceDirectory.GetFiles(pattern).Length == 0) //Before deleting make sure that Temp folder is empty.
sourceDirectory.Delete(); // Delete Temp folder after moving all the contents.
}
As a small performance improvement, you could replace sourceDirectory.GetFiles() with sourceDirectory.EnumerateFiles() in the for-loop. This will allow you to start moving them as the method finds them, not after they have all been found.

You are passing "*.txt" into the File.Exists() call when you need to be passing a path.
You can read the Documentation here
Alternatively you could use something like this:
Directory.GetFiles(destinationFolder).Contains(filename)

I agree with David here but also I think the flow of you logic should be adjusted a bit. The File.Exixts(filename); should occur inside the foreach.
That will allow you to iterate each file and if it exists do something.

Try adding the following to check if any files exist in the location:
bool exist = Directory.EnumerateFiles(sourceFolder, "*.txt").Any();

C# How to loop a large set of folders and files recursively without using a huge amount of memory

I want to index all my music files and store them in a database.
I have this function that i call recusively, starting from the root of my music drive.
i.e.
start > ReadFiles(C:\music\);
ReadFiles(path){
foreach(file)
save to index;
foreach(directory)
ReadFiles(directory);
}
This works fine, but while running the program the amount of memory that is used grows and grows and.. finally my system runs out of memory.
Does anyone have a better approach that doesnt need 4GB of RAM to complete this task?
Best Regards, Tys

Alxandr's queue based solution should work fine.
If you're using .NET 4.0, you could also take advantage of the new Directory.EnumerateFiles method, which enumerates files lazily, without loading them all in memory:
void ReadFiles(string path)
{
IEnumerable<string> files =
Directory.EnumerateFiles(
path,
"*",
SearchOption.AllDirectories); // search recursively
foreach(string file in files)
SaveToIndex(file);
}

Did you check for the . and .. entries that show up in every directory except the root?
If you don't skip those, you'll have an infinite loop.

You can implement this as a queue. I think (but I'm not sure) that this will save memory. At least it will free up your stack. Whenever you find a folder you add it to the queue, and whenever you find a file you just read it. This prevents recursion.
Something like this:
Queue<string> dirs = new Queue<string>();
dirs.Enqueue("basedir");
while(dirs.Count > 0) {
foreach(directory)
dirs.Enqueue(directory);
ReadFiles();
}

Beware, though, that EnumerateFiles() will stop running if you don't have access to a file or if a path is too long or if some other exception occurs. This is what I use for the moment to solve those problems:
public static List<string> getFiles(string path, List<string> files)
{
IEnumerable<string> fileInfo = null;
IEnumerable<string> folderInfo = null;
try
{
fileInfo = Directory.EnumerateFiles(str);
}
catch
{
}
if (fileInfo != null)
{
files.AddRange(fileInfo);
//recurse through the subfolders
fileInfo = Directory.EnumerateDirectories(str);
foreach (string s in folderInfo)
{
try
{
getFiles(s, files);
}
catch
{
}
}
}
return files;
}
Example use:
List<string> files = new List<string>();
files = folder.getFiles(path, files);
My solution is based on the code at this page: http://msdn.microsoft.com/en-us/library/vstudio/bb513869.aspx.
Update: A MUCH faster method to get files recursively can be found at http://social.msdn.microsoft.com/Forums/vstudio/en-US/ae61e5a6-97f9-4eaa-9f1a-856541c6dcce/directorygetfiles-gives-me-access-denied?forum=csharpgeneral. Using Stack is new to me (I didn't even know it existed), but the method seems to work. At least it listed all files on my C and D partition with no errors.

It could be junction folders wich leads to infinite loop when doing recursion but i am not sure , check this out and see by yourself . Link: https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/mklink