The big difference between this question and all the others out there is that the network share I want to copy a file on DOES NOT require credentials. I can map a drive to that share without entering a username and password and it works just fine. Here's my code:

```
try
{
    System.Diagnostics.Process.Start(@"\\UTMSFP23\GROUP\1217\");
    File.Copy(@"\\UTMSFP23\GROUP\1217\IS_TEMPLATE.xlsx", @"\\UTMSFP23\GROUP\1217\IS_" + todayFormatted2 + ".xlsx");
}
catch(Exception e)
{
    Console.WriteLine(e.ToString());
}

```

I can open a file explorer window to the directory I'm copying in but as soon as the debugger hits the file copy line it goes into the catch block and gives the following error: 

System.IO.IOException: Logon failure: unknown user name or bad password. 

I don't understand how I can map a drive to that share without entering credentials, open a file explorer to that very directory with no username or password but I can't copy a file in that directory to the same directory with a different name. I checked the security permissions on the template file to see if that was it but it has full control granted to everyone. Can someone help me out?