Generate a filename with number inside parenthesis

I'm working with asp.net project where user can upload files to server. I want to save the file with its original name, but if file with the same name already exists How can I generate a filename with a number in the parenthesis like windows does?

Files are uploaded to a particular folder and saved with its client side name itself. So, If a file named myimage.jpg is uploaded and a file with same name a开发者_如何学编程lready exists in the server, I need to rename it to myimage(1).jpg or if 'myimage.jpg' to 'myimage(n).jpg' exists, I need to rename it to myimage(n+1).jpg.

What will be the best way to search for and generate such file names? My first guess was to use linq with regex over DirectoryInfo.EnumerateFiles(), but is that a good approach?

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If the files with same orginal name don't have to be shown sorted by upload date/time, you could simply append System.Guid.NewGuid().ToString() to the file name.

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public static object lockObject = new object();
void UploadFile(...)
{
    //-- other code
    lock (lockObject)
    {
        int i = 1;
        string saveFileAs = "MyFile.txt";
        while (File.Exists(saveFileAs))
        {
           string fileNameWithoutExt = Path.GetFileNameWithoutExtension(saveFileAs);
           string ext = Path.GetExtension(saveFileAs)
           saveFileAs = String.Concat(fileNameWithoutExt, "(", i.ToString(), ")", ext);
           i++;
        }

        //-- Now you can save the file.
    }
}

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You don't need LINQ or regex.

If the original filename exists, append (1) to the name.
If that exists, append (2) to the (original) name.
And so on...