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private Int32 GetTableRowCount(string tableID)
{
    Int32 count = 0;

    if (webBrowser1.Document != null)
    {
        HtmlElement tableElem = webBrowser1.Document.GetElementById(tableID);
        if (tableElem != null)
        {
            foreach (HtmlElement rowElem in tableElem.GetElementsByTagName("TR"))
            {
                count++;
            }
        }
        else
        {
            throw(new ArgumentException("No TABLE with an ID of " + tableID + " exists."));
        }
    }

    return(count);
}

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http://msdn.microsoft.com/en-us/library/system.windows.forms.htmldocument.getelementbyid(VS.