How to move a file that has no file extension? C#

Question

if (File.Exists(@\"C:\\\\Users\" + Environment.UserName + \"\\\\Desktop\\\\test\"))
{                                                                /\\
                         


        

Answer 1

There's nothing special about extensionless files. Your code is broken because you use string concatenation to build a path and you're mixing verbatim and regular string literal syntax. Use the proper framework method for this: Path.Combine().

string fullPath = Path.Combine(@"C:\Users", Environment.UserName, @"Desktop\test");

if(File.Exists(fullPath))
{

}

You also should use the proper framework method to get the desktop path for the current user, see How to get a path to the desktop for current user in C#?:

string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

string fullPath = Path.Combine(desktopPath, "test");

Then you can call File.Move() to rename the file, see Rename a file in C#:

if(File.Exists(fullPath))
{
    string newPath = fullPath + ".txt";     
    File.Move(fullPath, newPath);
}