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System.Drawing.Image image = System.Drawing.Image.FromFile(fileName);
int widths = Convert.ToInt32(image.Width);
int heights = Convert.ToInt32(image.Height);
if (FileUpload1.HasFile)
{
System.Drawing.Image image = System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream);
Response.Write(image.Width);
}