How to make Antivirus software using c# ? scan all file

Question

How to make Antivirus software using c# ? scan all file in drive. when i try to get scan file from c drive it showerror that Unauthorised access. How to resolve. I used this code but its not working.

 

private void SetAccessRights(string file)

{

FileSecurity fileSecurity = File.GetAccessControl(file);

// DirectorySecurity fileSecurity = Directory.GetAccessControl(file);

AuthorizationRuleCollection rules = fileSecurity.GetAccessRules(true, true, typeof(NTAccount));

foreach (FileSystemAccessRule rule in rules)

{

string name = rule.IdentityReference.Value;

if (rule.FileSystemRights != FileSystemRights.FullControl)

{

FileSecurity newFileSecurity = File.GetAccessControl(file);

FileSystemAccessRule newRule = new FileSystemAccessRule(name, FileSystemRights.FullControl, AccessControlType.Allow);

newFileSecurity.AddAccessRule(newRule);

File.SetAccessControl(file, newFileSecurity);

}

}

}