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Copy file using relative path

File.Copy(#"my program\\subfolder\\what i want to copy.txt", "C:\\Targetlocation");
How can i copy a text file from one folder to another using relative path.

To execute the File.Copy the source and destination will be a valid file path. in your case the destination is a folder not File. in this case you may get some exception like
Could not find a part of the path 'F:\New folder'
While executing the application, the current directory will be the bin folder. you need to specify the relative path from there. Let my program/subfolder be the folders in your solution, so the code for this will be like this:
string sourcePath = "../../my program/subfolder/what i want to copy.txt";
string destinationPath = #"C:\Targetlocation\copyFile.txt"
File.Copy(sourcePath, destinationPath );
Where ../ will help you to move one step back from the current directory. One more thing you have to care is the third optional parameter in the File.Copy method. By passing true for this parameter will help you to overwrite the contents of the existing file.Also make sure that the folder C:\Targetlocation is existing, as this will not create the folder for you.

File.Copy(#"subfolder\\what i want to copy.txt", "C:\\Targetlocation\\TargetFilePath.txt");
The sourceFileName and destFileName parameters can specify relative or
absolute path information. Relative path information is interpreted as
relative to the current working directory. This method does not
support wildcard characters in the parameters.
File.Copy on MSDN
Make sure your target directory exists. You can use Directory.CreateDirectory
Directory.CreateDirectory("C:\\Targetlocation");
With Directory.CreateDirectory(), you don't have to check if the directory exists. From documentation:
Any and all directories specified in path are created, unless they
already exist or unless some part of path is invalid. The path
parameter specifies a directory path, not a file path. If the
directory already exists, this method does nothing.

// Remove path from the file name.
string fName = f.Substring(sourceDir.Length + 1);
try
{
// Will not overwrite if the destination file already exists.
File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
}

You can provide the relative path from your current working directory which can be checked via Environment.CurrentDirectoy.
For example if your current working directory is D:\App, your source file location is D:\App\Res\Source.txt and your target location is D:\App\Res\Test\target.txt then your code snippet will be -
File.Copy(Res\\Source.txt, Res\\Test\\target.txt);

Cannot read XML file with ReadXml Dataset Method

I have the following method:
public static DataSet BringProducts()
{
DataSet dataSet = new DataSet();
var dir = #"ProductsCookieData.xml";
if (File.Exists(dir)) //without File.Exists, same problem.
{
dataSet.ReadXml(dir);
}
return dataSet;
}
The file exists but the method does not see it ever. The file is in C:\, I tried in other locations and the same happens. Also tried without using static.
If I don't use the File.Exists(), FileNotFoundException is throwing.

With the way you declared the file
var dir = #"ProductsCookieData.xml";
Your file has to be in the same directory as your code/current webpage and not in C:. You can give permission to C:\ and change your code to
var dir = #"C:\ProductsCookieData.xml";
Sometimes, the file can be copied to your application folder, root or special folder and accessed with Server.MapPath
var dir = Server.MapPath("~/ProductsCookieData.xml");

You need to specify the full path to the file. Currently, you're only providing a relative path, which will be resolved relative to the current working directory.
If your file is in the root of C:\, then change your code to:
string dir = #"C:\ProductsCookieData.xml";

Saving file in folder and path in database

I want to save image into a folder and the path of the folder to the database.
I have done this with File.Copy(filepath) command but it is giving me error when a file with the same name already exists there.
Second thing in this command is that I have to provide a filename in it from which it is copying the file. If I am modifying a record and not the image then it is giving error that file source cannot be empty.
I have also tried Picture1.image.save(filename) but I have not found any command to overwrite the existing file.
Please help me by providing a simplest way to do all this.

There's an overload to the File.Copy() method that accepts a bool which will determine whether to overwrite any existing files with the same name.
http://msdn.microsoft.com/en-us/library/9706cfs5.aspx

File.Copy(sourceFileName, destFileName, true) Will force an overwrite of existing file.
Refer MSDN File.Copy

if(File.Exists(destinationFileName))
{
File.Delete(destinationFileName);
}
File.Copy(sourceFileName, destinationFileName);
sourceFileName shoudl be the full path of the source file(including the file name).
destinationFileName should be the fullpath (including the filename) where you want to save the file.

you have to first check whether file exists or not?
using FileInfo,
FileInfo file = new FileInfo(location);
if(file.Exists())
{
File.Delete(location);
File.Copy(srcLocation, location);
}
In this way you can avoid the error.

Open a text file with WPF

There is a text file that I have created in my project root folder. Now, I am trying to use Process.Start() method to externally launch that text file.
The problem I have got here is that the file path is incorrect and Process.Start() can't find this text file. My code is as follows:
Process.Start("Textfile.txt");
So how should I correctly reference to that text file? Can I use the relative path instead of the absolute path? Thanks.
Edit:
If I change above code to this, would it work?
string path = Assembly.GetExecutingAssembly().Location;
Process.Start(path + "/ReadMe.txt");

Windows needs to know where to find the file, so you need somehow specify that:
Either using absolute path:
Process.Start("C:\\1.txt");
Or set current directory:
Environment.CurrentDirectory = "C:\\";
Process.Start("1.txt");
Normally CurrentDirectory is set to the location of the executable.
[Edit]
If the file is in the same directory where executable is you can use the code like this:
var directory = Path.GetDirectoryName(Assembly.GetEntryAssembly().Location);
var file = Path.Combine(directory, "1.txt");
Process.Start(file);

The way you are doing this is fine. This will find the text file that is in the same directory as your exe and it will open it with the default application (probably notepad.exe). Here are more examples of how to do this:
http://www.dotnetperls.com/process-start
However, if you want to put a path in, you have to use the full path. You can build the full path while only caring about the relative path using the method listed in this post:
http://social.msdn.microsoft.com/Forums/en-US/vbgeneral/thread/e763ae8c-1284-43fe-9e55-4b36f8780f1c
It would look something like this:
string pathPrefix;
if(System.Diagnostics.Debugger.IsAttached())
{
pathPrefix = System.IO.Path.GetFullPath(Application.StartupPath + "\..\..\resources\");
}
else
{
pathPrefix = Application.StartupPath + "\resources\";
}
Process.Start(pathPrefix + "Textfile.txt");
This is for opening a file in a folder you add to your project called resources. If you want it in your project root, just drop off the resources folder in the above two strings and you will be good to go.

You'll need to know the current directory if you want to use a relative path.
System.Envrionment.CurrentDirectory
You could append that to your path with Path
System.IO.Path.Combine(System.Envrionment.CurrentDirectory, "Textfile.txt")

Try using Application.StartupPath path as default path may point to current directory.
This scenario has been explained on following links..
Environment.CurrentDirectory in C#.NET
http://start-coding.blogspot.com/2008/12/applicationstartuppath.html

On a windows box:
Start notepad with the file's location immediately following it. WIN
process.start("notepad C:\Full\Directory\To\File\FileName.txt");

Server.MapPath - Physical path given, virtual path expected

I'm using this line of code:
var files = Directory.GetFiles(Server.MapPath("E:\\ftproot\\sales"));
to locate files in a folder however I get the error message saying that
"Physical Path given but virtual path
expected".
Am new enough to using System.IO in C# so I was wondering if it's possible to enter a physical path to do this?

if you already know your folder is: E:\ftproot\sales then you do not need to use Server.MapPath, this last one is needed if you only have a relative virtual path like ~/folder/folder1 and you want to know the real path in the disk...

var files = Directory.GetFiles(#"E:\ftproot\sales");