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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;
}

How to go one step above in a folder path by using AppDomain.CurrentDomain.BaseDirectory in c#

I am using AppDomain.CurrentDomain.BaseDirectory and I want to go one step backwards but couldn't figure out how? Below is the example,
CODE :
string path = AppDomain.CurrentDomain.BaseDirectory;
RESULT :
"C:\\Mainline Code\\IxExpress\\.NET Applications\\IXTextIndexBuilder\\IXTextIndexBuilder\\bin\\Debug\\"
EXPECTED RESULT:
"C:\\Mainline Code\\IxExpress\\.NET Applications\\IXTextIndexBuilder\\IXTextIndexBuilder\\bin"

You can use something like the following to get the parent of a given directory:
string dirName = AppDomain.CurrentDomain.BaseDirectory; // Starting Dir
FileInfo fileInfo = new FileInfo(dirName);
DirectoryInfo parentDir = fileInfo.Directory.Parent;
string parentDirName = parentDir.FullName; // Parent of Starting Dir

Use following snippet:
string path = (new FileInfo(AppDomain.CurrentDomain.BaseDirectory)).Directory.Parent.FullName;

Directory.GetParent(AppDomain.CurrentDomain.BaseDirectory).Parent.FullName

Relative Path in the executing assembly

I am working on Unit tests that test a method in an application that produces a file. So I decided to put an expected file in a directory called Resource/Empower/.
The resource folder is at the same level as the bin folder of the Unit Test project.
Now what I want to do is get the path of the file name. I cannot hard code because I don't know exactly about the drives on the build server.
So how do I get the relative path of the file. Lets say if the file Name is expectedMasterFileSetUp.txt?
I want the path Resource/Empower/ExpectedMasterFileSetUp.txt

Why use a URI?
string AbsolutePathRelativeToEntryPointLocation( string relativePath )
{
Assembly entryPoint = Assembly.GetEntryAssembly() ;
string basePath = Path.GetDirectoryName( entryPoint.Location ) ;
string combinedPath = Path.Combine( basePath , relativePath ) ;
string canonicalPath = Path.GetFullPath( combinedPath ) ;
return canonicalPath ;
}

Use Path.GetDirectoryName() on the result of
new Uri(Assembly.GetExecutingAssembly().CodeBase).AbsolutePath
then Path.Combine() your relative path onto the end.

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

How can get the current virtual path without file name?

Request.Path will get the current Path name with file name such as:
C:/......./Personal/Items.aspx
How can I get the only Path name such as:
C:/......./Personal

You can use Path.GetDirectoryName to get the directory part of a path.
var path = System.IO.Path.GetDirectoryName(#"C:\Personal\Items.aspx");
// path is #"C:\Personal"

This will return the virtual path:
Page.TemplateSourceDirectory
See the below answers for the physical path.

Use the GetParent() method on Directory.
DirectoryInfo parent = Directory.GetParent(requestPath);

you can get Directory Path from System.IO.FileInfo
var fInfo = new System.IO.FileInfo(path);
var result = fInfo.DirectoryName;