为什么C#执行会直接跳过一些代码?

真是奇怪啊,当执行这个函数时直接跳到下面那个位置执行...        public void GetRegCodePic(System.Windows.Forms.WebBrowser webBrowerObj, string ImgName)
        {
            HTMLDocument doc = (HTMLDocument)webBrowerObj.Document.DomDocument;
            HTMLBody body = (HTMLBody)doc.body;
            IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();
            if (webBrowerObj.Document.GetElementById(ImgName) == null || webBrowser1.Url.ToString().IndexOf("www.tenpay.com/v2") < 0) return;
            IHTMLControlElement Img;
            Img = (IHTMLControlElement)webBrowerObj.Document.GetElementById(ImgName).DomElement;
            rang.add(Img);
            rang.execCommand("Copy", false, null);            //直接跳到这里执行了
            Bitmap bmp = (Bitmap)Clipboard.GetDataObject().GetData(DataFormats.Bitmap);
            if (Clipboard.ContainsData(DataFormats.Bitmap))
            {
                picR.Image = (Image)Clipboard.GetData(DataFormats.Bitmap);
            }
            Clipboard.Clear();
        }