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How to get parent directory in a path c#?

it is my path example E:\test\img\sig.jpg
I want to get E:\test\img to create directory
i try split but it be img
so I try function Directory.CreateDirectory and the path is E:\test\img\sig.jpg\
say me a ideas?

The recommended way is to use Path.GetDirectoryName():
string file = #"E:\test\img\sig.jpg";
string path = Path.GetDirectoryName(file); // results in #"E:\test\img"

Use Path.GetDirectoryName which returns the directory information for the specified path string.
string directoryName = Path.GetDirectoryName(filePath);

The Path class contains a lot of useful methods for path handling, which are more reliable than manual string manipulation:
var directoryComponent = Path.GetDirectoryName(#"E:\test\img\sig.jpg");
// yields `E:\test\img`
For completeness, I'd like to mention Path.Combine, which does the opposite:
var dirAndFile = Path.Combine(#"E:\test\img", "sig.jpg");
// no more checking for trailing slashes, hooray!
To create the directory, you can use Directory.Create. Note that it is not necessary to check if the directory exists first.

You can try this code to find the directory name.
System.IO.FileInfo fi = new System.IO.FileInfo(#"E:\test\img\sig.jpg");
string dirname = fi.DirectoryName;
and to create the directory
Directory.CreateDirectory(dirname );

Another solution can be :
FileInfo f = new FileInfo(#"E:\test\img\sig.jpg");
if (f.Exists)
{
string dirName= f.DirectoryName;
}

c# OpenFileDialogue Initial directory using relative path

How can I set the initial directory to be where my test data exists?
var relPath = System.IO.Path.Combine( Application.StartupPath, "../../" )
dlg.Title = "Open a Credit Card List";
dlg.InitialDirectory = relPath ;
The default directory it opens up to is where the .exe exists: Project2\Project2\bin\Debug
I want it to open up by default in the Project2 folder where my test data exists. But it does not allow me to move up a parent directory. How do I get around this?

You can use Directory.GetParent(string path)
string relPath = Directory.GetParent(Application.StartupPath).Parent.FullName;
Or using DirectoryInfo
DirectoryInfo drinfo =new DirectoryInfo(path);
DirectoryInfo twoLevelsUp =drinfo.Parent.Parent;
dlg.InitialDirectory = twoLevelsUp.FullName;;

To convert your relative path to an absolute path you can use Path.GetFullPath()
var relPath = System.IO.Path.Combine(Application.StartupPath, #"\..\..");
relPath = Path.GetFullPath(relPath);
dlg.InitialDirectory = relPath;
Alternatively if you wish to change the working directory to your test data:
Directory.SetCurrentDirectory(relPath);
More information:
http://msdn.microsoft.com/en-us/library/system.io.path.getfullpath.aspx
http://msdn.microsoft.com/en-us/library/system.io.directory.setcurrentdirectory.aspx

Need to get application folder

I need to get my application directory and add a file name to that path. So I used it this way.
String kofaxTextFilePath = Path.GetDirectoryName(Assembly.GetAssembly(typeof(File)).CodeBase) + "\\KofaxBatchHistory.txt"
So it will give a path like this.
“file:\\C:\\Documents and Settings\\MyApplication\\ KofaxBatchHistory.txt”
But I need to get only
C:\\Documents and Settings\\MyApplication\\ KofaxBatchHistory.txt
With out doing any thing to this string is there any method to get it directly?

string myDir = System.Reflection.Assembly.GetExecutingAssembly().Location;
myDir = System.IO.Path.GetDirectoryName(myDir);
String kofaxTextFilePath = System.IO.Path.Combine(myDir, "KofaxBatchHistory.txt");

Try Assembly.Location.
Assembly.GetAssembly(typeof(File)).Location
Or (better yet):
typeof(File).Assembly.Location

See Environment.SpecialFolder enumeration, http://msdn.microsoft.com/en-us/library/system.environment.specialfolder.aspx.
You might be looking for SpecialFolder.CommonApplicationData

Automatically create directories from long paths

I have a collection of files with fully qualified paths (root/test/thing1/thing2/file.txt). I want to foreach over this collection and drop the file into the location defined in the path, however, if certain directories don't exist, I want them to great created automatically. My program has a default "drop location", such as z:/. The "drop location" starts off empty, so in my example above, the first item should automatically create the directories needed to create z:/root/test/thing1/thing2/file.txt. How can I do this?

foreach (var relativePath in files.Keys)
{
var fullPath = Path.Combine(defaultLocation, relativePath);
var directory = Path.GetDirectoryName(fullPath);
Directory.CreateDirectory(directory);
saveFile(fullPath, files[relativePath]);
}
where files is IDictionary<string, object>.

string somepath = #"z:/root/test/thing1/thing2/file.txt";
System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName( ( somepath ) );

Directory.CreateDirectory("/root/...")
Creates all directories and subdirectories in the specified path

Check IO namespace (Directory, Path), I think they'll help you
using System.IO
Then check it..
string fileName =#"d:/root/test/thing1/thing2/file.txt";
string directory = Path.GetDirectoryName(fileName);
if (!Directory.Exists(directory))
Directory.CreateDirectory(directory);

string filename = "c:\\temp\\wibble\\wobble\\file.txt";
string dir = Path.GetDirectoryName(filename);
if (!Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
File.Create(filename);
with suitable exception handling, of course.

I've found setting the "default location" at the start of execution to be helpful and reduce a bit of redundant code (e.g., Path.Combine(defaultLocation, relativePath)).
Example:
var defaultLocation = "z:/";
Directory.SetCurrentDirectory(defaultLocation);
Directory.SetCurrentDirectory(AppContext.BaseDirectory);

How do I get Bin Path?

I need to the the bin path of the executing assembly.
How do you get it?
I have a folder Plugins in the Bin/Debug and I need to get the location

Here is how you get the execution path of the application:
var path = System.IO.Path.GetDirectoryName(
System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
MSDN has a full reference on how to determine the Executing Application's Path.
Note that the value in path will be in the form of file:\c:\path\to\bin\folder, so before using the path you may need to strip the file:\ off the front. E.g.:
path = path.Substring(6);

You could do this
Assembly asm = Assembly.GetExecutingAssembly();
string path = System.IO.Path.GetDirectoryName(asm.Location);

This is what I used to accomplish to this:
System.IO.Path.Combine(System.AppDomain.CurrentDomain.BaseDirectory, System.AppDomain.CurrentDomain.RelativeSearchPath ?? "");

var assemblyPath = Assembly.GetExecutingAssembly().CodeBase;

Path.GetDirectoryName(Application.ExecutablePath)
eg. value:
C:\Projects\ConsoleApplication1\bin\Debug

var path = Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase)?.Replace("file:\\", "");

Application.StartupPath
This is how you can access the bin / debug path

string parentDirName = new FileInfo(AppDomain.CurrentDomain.BaseDirectory).Directory.Parent.FullName;