http://www.cnblogs.com/long2006sky/articles/1258731.html
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private static void ConvertDataSetToXMLFile(DataSet xmlDS, string xmlFile)
{
MemoryStream stream = null;
XmlTextWriter writer = null;
try
{
stream = new MemoryStream();
//´Óstream×°ÔØµ½XmlTextReader
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int height = img.Height;
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graphics.DrawImage(watermark,
srcImg.Width - watermark.Width,
srcImg.Height - watermark.Height,
watermark.Width,
watermark.Height);
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graphics.Dispose();
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watermark.Dispose();
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