C#: How to set the value of an mshtml.HTMLInputFileElement

I am currently working on a project that needs to be able to set the value of an input element of type "file" in an HTML document using mshtml.HTMLInputFileElement. I am having a great deal of difficulty doing this.

First I tried this:

IHTMLInputFileElement element = (IHTMLInputFileElement)args[0];
string filename 
element.value = newFileName;

But the value was not set. I then read on another forum that the value property could not be set directly, but could be set by giving the focus to that in开发者_如何学运维put element and then using SendKeys to send the value to the file element like so:

HTMLInputElement writableFileElement = (HTMLInputElement)element;
writableFileElement.focus();
SendKeys.SendWait(newFileName);

this also failed and threw a COM exception saying that the field was not writable.

Is there any way to set the value field of an HTMLInputFileElement?

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No, search "browser file input stealing" in your favorite search engine for reasons.

The SendKeys hack was patched in IE8 and Firefox 2 I think.