C# - remove property tag items from tif file

Question

I'm trying clear some property tag item from tif file.
My test code is:

Image sourceImg = new Bitmap("A10034.tif");
Image img = (Image)sourceImg.Clone();
sourceImg.Dispose();

PropertyItem[] propertyItemsList = img.PropertyItems;
foreach (PropertyItem property in propertyItemsList)
{
    if ((property.Id == 270 || property.Id == 271 || property.Id == 272 || property.Id == 305 ||
         property.Id == 315 || property.Id == 316) || (property.Id > 320 && property.Id != 33432))
    {
        img.RemovePropertyItem(property.Id);
    }
}

ImageCodecInfo Encoder = GetEncoderInfo("image/tiff");
EncoderParameters EncoderParams = new EncoderParameters(2);
EncoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (Int64)EncoderValue.CompressionNone);
EncoderParams.Param[1] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L);
if (System.IO.File.Exists("cleared_A10034.tif"))
{
    System.IO.File.Delete("cleared_A10034.tif");
}
img.Save("cleared_A10034.tif", Encoder, EncoderParams);
img.Dispose();

This works in WinXp and Win 8 but don't work in Win 7.
All tags in destination file same as source file in Win7. Nothing delete.
Any ideas?
Thanks.
You can download test project if needed.

Answer 1

Problem resolved.
I added image rotate before saving and all works now.

img.RotateFlip(RotateFlipType.Rotate180FlipNone);
img.RotateFlip(RotateFlipType.Rotate180FlipNone);
img.Save("cleared_" + fileName, Encoder, EncoderParams);

Strange, but this works.