Copy

Copies a file from one location to another.
This method will fail if the file already exists and you have not explicitly stated to overwrite the file.
You also have the option to overwrite the file it it already exists.

System.IO.File.Copy(source, dest [,overwrite]); 
System.IO.File.Copy("file1.txt","file2.txt",false); 
System.IO.File.Copy("file1.txt","file2.txt",true);