Object Ref error while reading XML Data

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ASP.NET

Hi
I want to show XML data on labels.I have xml File "Form Data.xml" .I want to show Address1 .I wrote following code
for same. But When I run I got error..Object reference not set to an instance of an object. on

Label1.Text = xmldoc.SelectSingleNode("/FormData/Address/Address1").FirstChild.Value;

Form Data.xml :

<AvokaSmartForm>
    <FormData>
        <CurrentPage>1</CurrentPage>
        <CustomerDetails>
            <CIDN/>
            <CompanyDetails>
                <ABN>62091152573</ABN>
                <ACN>091152573</ACN>
                <ABNACN/>
                <CompanyName>RSJ TRADING PTY LTD T/AS BM GU</CompanyName>
                <BusinessName>RSJ TRADING PTY LTD T/AS BM GU</BusinessName>
                <Address>

                    <Address1>700 WATERDALE RD</Address1>
                    <Address2/>
                    <Suburb>BANDURA</Suburb>
                    <State>VIC</State>
                    <Postcode>3083</Postcode>
                </Address>

Code : Check Path "/FormData/Address/Address1" is correct as per above File or not.

XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(@"C:\inetpub\wwwroot\Form Data.xml");
Label1.Text = xmldoc.SelectSingleNode("/FormData/Address/Address1").FirstChild.Value;

Please Tell me ..