Try this code,
FileInfo objFile = new FileInfo(path1);
FileSecurity objFileSecurity = objFile.GetAccessControl();
objFileSecurity.AddAccessRule(new FileSystemAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), FileSystemRights.Delete, AccessControlType.Deny));
objFileSecurity.AddAccessRule(new FileSystemAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), FileSystemRights.TakeOwnership, AccessControlType.Deny));
objFileSecurity.AddAccessRule(new FileSystemAccessRule(new SecurityIdentifier(WellKnownSidType.WorldSid, null), FileSystemRights.ReadData, AccessControlType.Allow));
objFile.SetAccessControl(objFileSecurity);