Asp.net + Google Charts - 附加的html文件无法正确打开

I have an Asp.Net page containing one grid and an image. The image is a google charts chart and its urls is around 1600 characters. I out together an .htm file containing the grid and the image. For the grid I use RenderControl to get its html code, and for the image, I just add an img html tag and assing the url to its src. I then send this .htm file as an email attachment.I have an Asp.Net page containing one grid and