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Change file attribute with c# cmd command

I want to change file attribute with cmd.exe via c#.
But when I Executed the program. It don't any changes.

Please help, where's my mistake?

string arguments = @"attrib -r -h -s C:\WINDOWS\system32\drivers\etc\hosts";
System.Diagnostics.Process.Start("cmd.exe", arguments);

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3 Solutions
Do you really have to use "cmd.exe"?

the following C# code will have the same effect without launching a seperate process.
FileInfo f =  new FileInfo(@"C:\WINDOWS\system32\drivers\etc\hosts");
f.Attributes = f.Attributes & ~FileAttributes.ReadOnly & ~FileAttributes.System & ~FileAttributes.Hidden;

File.SetAttributes(...) can also be used to set file attributes if you know the exact desired attributes.
fancyfantaAuthor Commented:
Thank you @jasonduan,
and then how can I lock down the file? I mean I want to get back the ex attributes.
you can save the attributes:
FileAttributes orgAttributes = f.Attributes;
then restore it when you done:
f.Attributes = orgAttributes;
File.SetAttributes(@"c:\....", orgAttributes);
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fancyfantaAuthor Commented:
It gives error:
The name 'orgAttributes' does not exist in the current context
fancyfantaAuthor Commented:
Sorry my mistake.
But I want to change attributes to readonly, system file and hidden
How can i?
I dont want to orginals
This is one of the best examples on the net that I
You can refer too. http://www.csharp-examples.net/file-attributes/
this code changes attributes to readonly, system file and hidden

File.SetAttributes(@"c:\....", FileAttributes.ReadOnly | FileAttributes.System | FileAttributes.Hidden);
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