int HeightMax = 0;
int WidthMax =0;
HeightMax = webBrowser1.Document.Body.ScrollRectangle.Height-webBrowser1.ClientRectangle.Height;
WidthMax = webBrowser1.Document.Body.ScrollRectangle.Width-webBrowser1.ClientRectangle.Width;
//滚动到指定位置
webBrowser1.Document.Window.ScrollTo(WidthMax, HeightMax);