Question

I’m trying to click a link using this line:

webBrowser1.Document.GetElementsByTagName("a")[i].InvokeMember("click");

But when the element is not present on the page it gives me the error Value of '0' is not valid for 'index'.

I tried testing the element’s presence first:

if (webBrowser1.Document.GetElementsByTagName("a") != null) {...}

But this doesn’t seem to work.

How do I check if the element is present?

Answer 1

Apparently webBrowser1.Document.GetElementsByTagName("a") yields an empty collection.

Your second sample test for null but that is something different.

Use the debugger to see webBrowser1.Document.GetElementsByTagName("a").Count