Scale down the image by proportion (scale down the height by width)

/// <Summary>
/// Scale down the image in proportion (scale down the height and scale down the image in width)
/// </Summary>
/// <Param name = "imagemap"> image displayed on the page </param>
/// <Param name = "ImagePath"> image virtual path </param>
/// <Param name = "widthsize"> width of the cropped image </param>
/// <Param name = "server"> server on this page </param>
Public void imagesize (system. Web. UI. webcontrols. Image Imagemap, string ImagePath, int widthsize, system. Web. httpserverutility server)
{
System. Drawing. Image IMG = system. Drawing. image. fromfile (server. mappath (ImagePath ));
Int imgwidth = IMG. width;
Int imgheight = IMG. height;
Imagemap. imageurl = ImagePath;
If (imgwidth> widthsize)
{
Imagemap. width = widthsize;
Imagemap. Height = widthsize * imgheight/imgwidth;
}
}