Convert IEnumerable<XElement> to XElement

The return type of my query is IEnumerable<XElement>. how can i convert the resultant data to XElement type? is it possible? could some body help me to understand this.

var resQ = from e in docElmnt.Descendants(xmlns + Constants.T_ROOT)
                             .Where(x => x.Attribute(Constants.T_ID).Value == "testid") 
           select e;

I have to pass resQ as a parameter to the below function. in order to do that I have to convert resQ to XElement type.

Database.usp_InsertTestNQuestions(tid, qId, qstn, ans, resQ );

Solution

As long as your query only returns a single result, you can either call Single() or First() on the result (also, there's no need for the extra query syntax up top):

// Use if there should be only one value.
// Will throw an Exception if there are no results or more than one.
var resQ = docElmnt.Descendents(xmlns + Constants.T_ROOT)
                   .Single(x => x.Attribute(Constants.T_ID).Value == "testid");

// Use if there could be more than one result and you want the first.
// Will throw an Exception if there are no results.
var resQ = docElmnt.Descendents(xmlns + Contants.T_ROOT)
                   .First(x => x.Attribute(Constants.T_ID).Value == "testid");

If you want to handle the case when no results are returned for the query without throwing an Exception, you can use SingleOrDefault (which will still throw an Exception if you get more than one result) or FirstOrDefault.