Error to find the existing table from the word document using open XML

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C#2.0

C#

ASP.NET2

I am finding the Table and the Row from the Word document using Open XML, but getting errors specified the Bold part. Following is the Error getting while building the Application.

'System.Collections.Generic.IEnumerable<documentformat.openxml.wordprocessing.table>' does not contain a definition for 'First'

'System.Collections.Generic.IEnumerable<documentformat.openxml.wordprocessing.tablerow>' does not contain a definition for 'ElementAt'


// Find the first table in the document.
DocumentFormat.OpenXml.Wordprocessing.Table table =
doc.MainDocumentPart.Document.Body.Elements<documentformat.openxml.wordprocessing.table>().First();
// Find the second row in the table.
DocumentFormat.OpenXml.Wordprocessing.TableRow row = table.Elements<documentformat.openxml.wordprocessing.tablerow>().ElementAt(1);


Declared the following namespace also in the application

using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using System.Xml.Linq;