We Keep Coding

How to rename a file with string format in C#?

This is the situation:
I created a new file name using the string format like:
string newFileName = string.Format("{0}/{1}/{2}/{3}.txt", FileInfo.Year,
FileInfo.Month, FileInfo.Day, FileInfo.Time);
and I have another(old) file with a path: string path = #"C:\Users\Public\fileName.txt"
I would like to change or move the old --> the new. How to do that? Is it possible to change the path of the new?
Is there anyone who can help me. Thanks in advance

string path = #"C:\Users\Public\fileName.txt";
if (File.Exists(path))
File.Move(path, "DestinationFilePath");

URI formats are not supported in c#

I am trying to insert my data in to xml file. the xml file location
path: http://AutoCompleteInGridView%20new1/Design/Pro/pricelist.xml.
when inserting my data i got error URI formats are not supported.
It shows argument exception was unhandled.I want to save my xml
file in server system.these url belongs to ServerPath location.
can anyone give me a suggestion or links to solve these problem.
here is the error:

Use this sample:
string uriPath = "YourAddress/pricelist.xml";
string localPath = new Uri(uriPath).LocalPath;

Try like this:
string SavePathUrl = ConfigurationManager.AppSettings["SavePathUrl"];
string strFileName = DateTime.Now.ToString("dd-mmm-yyyy-hh-mm-ss-ffffff") + "^" + fileName;
File.WriteAllBytes(new Uri(SavePathUrl).AbsoluteUri + strFileName, Convert.FromBase64String(base64String));
return strFileName;

you could try with this solution:
http://social.msdn.microsoft.com/Forums/en-US/eccd585a-ac2b-4700-aa28-abb4802cd3a5/uri-formats-are-not-supported-error-with-xmlsave?forum=xmlandnetfx
Basically, use
doc.Save(Server.MapPath("~/EEPPriceList/Products.xml"))

How to combine two path

I have the code below and I get the result like this
C:\\Users\\Administrator\\Projects\\CA\\Libraries\\ConvertApi-DotNet\\Example\\word2pdf-console\\bin\\Release\\\\..\\..\\..\\..\\test-files\\test.docx
The file is found but I would like to show user this path and the formating is not user friendly. I would like to get
C:\\Users\\Administrator\\Projects\\CA\\Libraries\\test-files\\test.docx
I have tried to use Path.Combine but it do not work.
var baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
string inFile = baseDirectory + #"\..\..\..\..\test-files\test.docx";

You could use a combination of Path.Combine and Path.GetFullPath:
var baseDirectory = AppDomain.CurrentDomain.BaseDirectory;
var file = #"..\..\..\..\test-files\test.docx";
string inFile = Path.GetFullPath(Path.Combine(baseDirectory, file));

Description
You say that the file is found.
Then you can use FileInfo (namespace System.IO) for that.
Sample
FileInfo f = new FileInfo(fileName);
f.Exists // Gets a value indicating whether a file exists.
f.DirectoryName // Gets a string representing the directory's full path.
f.FullName // Gets the full path of the directory or file.
More Information
MSDN - FileInfo Class

Change File Extension Using C#

I have many file types: pdf, tiff, jpeg, bmp. etc.
My question is how can I change file extension?
I tried this:
my file= c:/my documents/my images/cars/a.jpg;
string extension = Path.GetExtension(myffile);
myfile.replace(extension,".Jpeg");
No matter what type of file it is, the format I specify must be with the file name. But it does not work. I get file path from browser like c:\..\..\a.jpg, and the file format is a.jpeg. So, when I try to delete it, it gives me an error: Cannot find the file on specified path'. So, I am thinking it has something to do with the file extension that does not match. So, I am trying to convert .jpg to .jpeg and delete the file then.

There is: Path.ChangeExtension method. E.g.:
var result = Path.ChangeExtension(myffile, ".jpg");
In the case if you also want to physically change the extension, you could use File.Move method:
File.Move(myffile, Path.ChangeExtension(myffile, ".jpg"));

You should do a move of the file to rename it. In your example code you are only changing the string, not the file:
myfile= "c:/my documents/my images/cars/a.jpg";
string extension = Path.GetExtension(myffile);
myfile.replace(extension,".Jpeg");
you are only changing myfile (which is a string). To move the actual file, you should do
FileInfo f = new FileInfo(myfile);
f.MoveTo(Path.ChangeExtension(myfile, ".Jpeg"));
See FileInfo.MoveTo

try this.
filename = Path.ChangeExtension(".blah")
in you Case:
myfile= c:/my documents/my images/cars/a.jpg;
string extension = Path.GetExtension(myffile);
filename = Path.ChangeExtension(myfile,".blah")
You should look this post too:
http://msdn.microsoft.com/en-us/library/system.io.path.changeextension.aspx

The method GetFileNameWithoutExtension, as the name implies, does not return the extension on the file. In your case, it would only return "a". You want to append your ".Jpeg" to that result. However, at a different level, this seems strange, as image files have different metadata and cannot be converted so easily.

Convert file format to png
string newfilename ,
string filename = "~/Photo/" + lbl_ImgPath.Text.ToString();/*get filename from specific path where we store image*/
string newfilename = Path.ChangeExtension(filename, ".png");/*Convert file format from jpg to png*/

Alternative to using Path.ChangeExtension
string ChangeFileExtension(ReadOnlySpan<char> path, ReadOnlySpan<char> extension)
{
var lastPeriod = path.LastIndexOf('.');
return string.Concat(path[..lastPeriod], extension);
}
string myfile= #"C:/my documents/my images/cars/a.jpg";
string changedFileExtesion = ChangeFileExtension(myfile, ".jpeg");
Console.WriteLine(changedFileExtesion);
// output: C:/my documents/my images/cars/a.jpeg

How to copy a file in C#

I want to copy a file from A to B in C#. How do I do that?

Without any error handling code:
File.Copy(path, path2);

The File.Copy method:
MSDN Link

Use the FileInfo class.
FileInfo fi = new FileInfo("a.txt");
fi.CopyTo("b.txt");

This should work!
using System.IO;
...
var path = //your current filePath
var outputPath = //the directory where you want your (.txt) file
File.Copy(path,outputPath);

System.IO.File.Copy