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System.NotSupportedException : 'The format of the given path is not supported.' C#

For searching files in a directory, I am using this snippet of code :
string targetToCopy = ConfigurationManager.AppSettings["drive"] + element.Element("categorie").Value.ToString().Replace(" / ", #"\");
DirectoryInfo directoryToCopy = new DirectoryInfo(targetToCopy);
I create the path with this string targetToCopy, I parse the string in DirectoryInfo for using the directoryToCopy.GetFiles() method.
This method searches files with path, and when I use this in my loop, I get an error:
System.NotSupportedException : 'The format of the given path is not supported.'
I don't know what this error means, but if you know how to solve the problem.
Thank you and good luck :)

I determined the problem by outputting my path to a log file, and finding it not formatting correctly. Correct for me was quite simply:
DirectoryInfo diTemp = new DirectoryInfo(strSomePath);
FileStream fsTemp = new FileStream(diTemp.FullName.ToString());

There is a space before the / in Replace(" / ", #"\") therefore String.Replace transformation is not in effect
Updated code
string targetToCopy = ConfigurationManager.AppSettings["drive"] + element.Element("categorie").Value.ToString().Replace("/ ", #"\");

Remove Extra back slash "\" from string file path in c#

How to convert
"String path = #"C:\Abc\Omg\Why\Me\\\\\\\\\\\\\\\\\\\\\";
into
String path = #"C:\Abc\Omg\Why\Me\".
My approach is to first reverse the string and then remove all the "\" till we get first char, and the reverse it again.
How to do this in C#, is there any method for such operation?

You can just construct path using the Path static class:
string path = Path.GetFullPath(#"C:\Abc\Omg\Why\Me\\\\\\\\\\\\\\\\\\\\\");
After this operation, variable path will contain the minimal version:
C:\Abc\Omg\Why\Me\

You can use path.TrimEnd('\\'). Have a look at the documentation for String.TrimEnd.
If you want the trailing slash, you can add it back easily.

var path = #"C:\Abc\Omg\Why\Me\\\\\\\\\\\\\\\\\\\\\";
path = path.TrimEnd('\\') + '\\';
another solution is
var path = #"C:\Abc\Omg\Why\Me\\\\\\\\\\\\\\\\\\\\\";
path = Path.GetFullPath(path);

Special chars in query string

I am passing a query string parameter containing file name.
default.aspx?file=Fame+ adlabs.xml (Fame+ adlabs.xml is the actual file name on server). The file name has "+" & also blank spaces.
When I check for file name from query string as follows:
var fileName = Request.QueryString["file"];
The variable filename does not have a "+" in it. It reads as "Fame adlabs.xml" & hence I get a file not found exception. I cannot rename the xml files. Can someone please guide me into right direction.
Thanks

If you are trying to do it at the server in C#:
String FileName = "default.aspx?";
String FullURL = FileName + HttpUtility.UrlEncode("Fame + adlabs.xml");
String Decoded = HttpUtility.UrlDecode(FullURL);

You should URL encode into your javascript before sending it :
var name = "Fame+ adlabs.xml";
var url = "default.aspx?file=" + encodeURIComponent(name);
Pay attention that following char won't work : ~!*()'

Removing file extension in asp.net

How can I remove the extension file in asp.net something like filename.jpg to filename? I tried searching some reference but all I find is URL extension only

Use the System.IO.Path.GetFileNameWithoutExtension Method
The return value for this method is the string returned by GetFileName, minus the last period (.) and all characters following it.
string fileName = Path.GetFileNameWithoutExtension(fuImage.FileName); //file-name
string fileExt = Path.GetExtension(fuImage.FileName); //.jpg,.png....
string path_thumb = Path.Combine("Images/", string.Format("{0}{1}{2}", fileName, "-" + datetime + "-thumb", fileExt)); //full path: Images/file-name-012345-thumb.jpg

Path format is illegal

I want to ask about a easy question , but I faced a problem.
I want to get the time when the program is executed
Console.WriteLine(DateTime.Now);
And I want to output a .log file , the file name will have program execution time
String path2 = "C:\\temp"+DateTime.Now+".log";
StreamWriter path = File.CreateText(path2);
path.WriteLine(DateTime.Now);
But it is telling me Path format is illegal.
And I want ask another question
string a12 = aaa.Element("a12").tostring();
String path2 = "C:\\temp" + a12.ToString + ".log";
But it tell me "Path format is illegal"
How can I resolve it?
Thanks

That's because DateTime.Now converted to string by default contains time information (e.g. 8:53). Semicolon is illegal in path name.
If you meant only date to be in your file name, you could use:
String path2 = "C:\\temp" + DateTime.Now.ToString("d") + ".log";
(Edit) For some cultures this still can lead to invalid values, so as others pointed out, it is best to use explicit formatter:
String path2 = "C:\\temp" + DateTime.Now.ToString("yyyy-MM-dd") + ".log";

You want to escape your \ in the "" quoted string, and also there are characters in the result of DateTime.Now that cannot be in paths. You'll need to escape/replace those as well.

When you put DateTime.Now into a path, you risk adding characters that aren't valid as a path (like the : separator. That is the reason you get this error message.
You could replace it with a .:
string path2 = Path.Combine
( #"C:\temp\"
, DateTime.Now.ToString("yyyy-MM-dd.HH24.mm.ss")
, ".log"
);

DateTime.Now probably contains illegal characters depending on your local system settings. To get a valid and consistent file name independent on the culture the system is installed in you should create the log file name by hand, for instance like this:
String path2 = "C:\\temp" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".log";

String path2 = String.Format("C:\\temp{0}.log", DateTime.Now.ToString("yyyyMMdd"));
Since filename cannot take "/" which was created by DateTime.Now.ToString("d") and hence creating issue.