[C#] How to Replace a File in C#

The Replace method replaces the contents of a specified file with the contents of another file. This method deletes the original file and creates a backup of the replaced file.
The following code snippet moves the contents of the original file into the replaced file and also creates a backup of the replaced file and deletes the original file.

string repFile = @"C:\repFile.txt";
string backupFile = @"C:\backupFile.txt.bac";
string fileName = @"C:\fileName.txt";
FileInfo filetoreplace = new FileInfo(fileName);
		filetoreplace.Replace(repFile, backupFile, false);
catch (IOException ex)
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