If you’re trying to compile an ASP.NET project/website in Visual studio 2012 or 2010 and getting error:

Value of type ‘System.Web.UI.HtmlControls.HtmlGenericControl’ cannot be converted to ‘System.Web.UI.HtmlControls.HtmlTableRow’

chances are you have an HTML table in your ASPX markup with runat="server" attribute set and <tbody> or <thead> tags present. Remove <tbody> and <thead> tags and the error should go away.