Develop Reference

How to create file text in "AppData\Roaming" for any user in C#

I'd like save date my app but I'm not knowing if app save for different users, Example if "andy" I can't use ("C:\Users\Game maker\AppData\Roaming") ,So How to create file in "AppData\Roaming\MaxrayStudyApp" for any user .
Computer myComputer = new Computer();
myComputer.FileSystem.WriteAllText(#"C:\Users\Game maker\AppData\Roaming\MaxrayStudy\data.txt","", false);

Almost a duplicate of this one: Environment.SpecialFolder.ApplicationData returns the wrong folder
Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
That should get the folder you need then use Path.Combine() to write to a directory in that folder.
var roamingDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
var filePath = Path.Combine(roamingDirectory, "MaxrayStudy\\data.txt");

I restart my windows and I write this
string filePath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
filePath= (filePath+#"\MaxrayStudyApp\data.txt");
string path =Convert.ToString(filePath);
using (System.IO.StreamWriter file =
new System.IO.StreamWriter(filePath,false)){
file.WriteLine(" XP : 0");}

Uploading files from a network share

I am trying copy a file from a network share (drive letter\folder) to a SharePoint document library using asp.net (C#) when I run the code locally and select a drive letter to copy from everything works fine, but when I publish it to IIS I get an error - Could not find a part of the path 'L:\Test\Test.Doc'. I am guessing this is because the drive mapping doesn't exist from IIS.
The code to get the file is:
if (FileUpload1.HasFile)
{
string spSite = System.Configuration.ConfigurationManager.AppSettings["SharePointSite"];
string RelativePath = System.Configuration.ConfigurationManager.AppSettings["DocumentLibraryRelativePath"];
SharePointIntegration sp = new SharePointIntegration();
string fileExtension = Path.GetExtension(FileUpload1.PostedFile.FileName);
string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName);
string filePath = Path.GetDirectoryName(FileUpload1.PostedFile.FileName) + "\\" + fileName + fileExtension;
sp.UploadDocument(spSite, RelativePath, "Documents", filePath, fileName, recordID.ToString(), (string)HttpContext.Current.Session["UserName"], fileExtension);
GetAttachments();
}
I am using the SaveBinaryDirect method to save the file in SharePoint - sp.UploadDocument(spSite, RelativePath, .......).
What do I need to change to get the file when it is running on IIS?

How to move a file that has no file extension? C#

if (File.Exists(#"C:\\Users" + Environment.UserName + "\\Desktop\\test"))
{ /\
this file has no file extension
}
The file test has no extension and I need help to either move or rename this file to something with a extension

Having no extension has no bearing on the function.
Also, a rename is really just a move "in disguise", so what you want to do is
File.Move(#"C:\Users\Username\Desktop\test", #"C:\Users\Username\Desktop\potato.txt")
Please bear in mind the # before the string, as you haven't escaped the backslashes.

There's nothing special about extensionless files. Your code is broken because you use string concatenation to build a path and you're mixing verbatim and regular string literal syntax. Use the proper framework method for this: Path.Combine().
string fullPath = Path.Combine(#"C:\Users", Environment.UserName, #"Desktop\test");
if(File.Exists(fullPath))
{
}
You also should use the proper framework method to get the desktop path for the current user, see How to get a path to the desktop for current user in C#?:
string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
string fullPath = Path.Combine(desktopPath, "test");
Then you can call File.Move() to rename the file, see Rename a file in C#:
if(File.Exists(fullPath))
{
string newPath = fullPath + ".txt";
File.Move(fullPath, newPath);
}

You can get all files without extension in this way:
var files = Directory.EnumerateFiles(#"C:\Users\Username\Desktop\")
.Where(fn => string.IsNullOrEmpty(Path.GetExtension(fn)));
Now you can loop them and change the extension:
foreach (string filePath in filPaths)
{
string fileWithNewExtension = Path.ChangeExtension(filePath, ".txt");
string newPath = Path.Combine(Path.GetDirectoryName(filePath), fileWithNewExtension);
File.Move(filePath, newPath);
}
As you can see, the Path-class is a great help.
Update: if you just want to change the extension of a single file that you already know it seems that Dasanko has already given the answer.

File uploading into server

I am making a website having image upload module.In my localhost server its working perfectly. That means i can upload images and save it. But when i host my solution i am getting a error. That is, Access to the path is denied.
This is the code i have used...
string fileName = FileUpload1.FileName.ToString();
string uploadFolderPath = "~/up_foto/";
string filePath = HttpContext.Current.Server.MapPath(uploadFolderPath);
FileUpload1.SaveAs(filePath + "\\" + fileName);`
What the wrong in this.. Please help me....
Thanks in advance....

I am afraid there's nothing wrong with your code, if it runs locally. Instead, you have to make sure if on the host environment the user "IUSER", or "IIS_IUSER", or the like, has access (Read/Write) to the upload folder.

Since you are getting "Access to the path is denied", Did you check the folder you are trying to upload is having write access

you can use Path.combine or server.mappath (dont forget to add System.IO in the namespaces)
string fileName = FileUpload1.FileName.ToString();
string uploadFolderPath = "~/Uploads/Images/";
string filePath1 = Server.MapPath(uploadFolderPath + fileName);
or
string fileName = FileUpload1.FileName.ToString();
string uploadFolderPath = "~/Uploads/Images/";
string filePath = Server.MapPath(uploadFolderPath);
string filePath1= Path.Combine(filepath1 + fileName);

C# trim application path

I have this application path:
C:\Documents and Settings\david\My Documents\app\
And a file path:
C:\Documents and Settings\david\My Documents\app\stuff\file.txt
How can I trim the application path from the file path so it becomes stuff\file.txt? Reason being one of the command line tools I'm using doesn't support spaces in the file path.

Try this:
Uri path = new Uri(#"C:\Documents and Settings\david\My Documents\app\stuff\file.txt");
Uri workingDirectory = new Uri(Directory.GetCurrentDirectory());
string relativePath = workingDirectory.MakeRelativeUri(path).ToString();
Related documentation:
Uri.MakeRelativeUri
Directory.GetCurrentDirectory

i don't know which command tool you are using, but normally they work if we enclosed the string/ path in quotation marks like this
"C:\Documents and Settings\david\My Documents\app\stuff\file.txt"

Not sure why normal string replace won't do:
string filePath = #"C:\Documents and Settings\david\My Documents\app\stuff\file.txt";
string appPath = #"C:\Documents and Settings\david\My Documents\app\";
string trimmed = filePath.Replace(appPath, "");
However, if you simply enclose the full path in quotes ("), most command line tools will be fine with spaces:
string escapedPath = #"""C:\Documents and Settings\david\My Documents\app\stuff\file.txt""";