how to nullify a function within a function? Funcception?

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so, i have the code:

HtmlElement troopmov = wb.Document.All["movements"];
            troopmov.GetAttribute("mov");
            troopsmov.Text = troopmov.InnerText;

troopmov is my variable to represent the seeked data.
movements is the ID of my seeked data.
mov is THEE seeked data(this is the data that i want to get, but it doesn't show up all the time. just sometimes.)
troopsmov is the label that i want to place that data from mov into..

so, i need to run the above code, ONLY if there is data to gather.
thanks