reflection not working in windows 7 office 64 bit

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Windows

Office

MS-Excel

64-bit

below is the code which i use to access a url through a excel add-in.

This works perfectly fine in windows xp office 32 bit, windows 7 office 32 bit, but DOESNOT work in Windows 7 Office 64 bit.

Kindly help.

We have a web browser by name webBrowserChat as shown below.
System.Windows.Forms.WebBrowser webBrowserChat;

HtmlElement buttonConnect = webBrowserChat.Document.GetElementById("sendData");
object obj = buttonConnect.DomElement;
System.Reflection.MethodInfo mi = obj.GetType().GetMethod("click");
mi.Invoke(obj, new object[0]);