webbrowser控件中选定radio项的有关问题

webbrowser控件中选定radio项的问题
页面上有三个radio，如下：

<INPUT   type= "radio "     id=DeliveryID     value=1029     NAME= "DeliveryID ">
<INPUT   type= "radio "     id=DeliveryID     value=1028     NAME= "DeliveryID ">
<INPUT   type= "radio "     id=DeliveryID     value=1050     NAME= "DeliveryID ">

我需要让程序选中value＝1029的那个radio，代码应该怎么写

[解决办法]
//项目中添加Micrsoft.mshtml引用
using mshtml;


IHTMLDocument2 vDocument =
(IHTMLDocument2)webBrowser1.Document.DomDocument;
foreach (IHTMLElement vElement in vDocument.all)
{
if (vElement.tagName.ToLower() == "input ")
{
IHTMLInputElement vInputElement = (IHTMLInputElement)vElement;
if (vInputElement.type.ToLower() == "radio " &&
vInputElement.value.ToLower() == "1029 ")
vInputElement.@checked = true;
}
}