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Quering RDF File in RDFDOTNET
//Define your Graph here - it may be better to use a QueryableGraph if you plan
    //on making lots of Queries against this Graph as that is marginally more performant
    IGraph g = new Graph();

    //Load some data into your Graph using the LoadFromFile() extension method
    g.LoadFromFile("C:/Users/admin/Desktop/current/Semantic/test.rdf");

    //Use the extension method ExecuteQuery() to make the query against the Graph
    try
    {


        String q = " Prefix u:<http://localhost:49682/Semantic/test.rdf> SELECT * WHERE {?x1 u:age ?x2}";
        Object results = g.ExecuteQuery(q);

        if (results is SparqlResultSet)
        {
            //SELECT/ASK queries give a SparqlResultSet
            SparqlResultSet rset = (SparqlResultSet)results;
            foreach (SparqlResult r in rset)
            {
                //Do whatever you want with each Result
            }
        }
        else if (results is IGraph)
        {
            //CONSTRUCT/DESCRIBE queries give a IGraph
            IGraph resGraph = (IGraph)results;
            foreach (Triple t in resGraph.Triples)
            {
                //Do whatever you want with each Triple
            }
        }
        else
        {
            //If you don't get a SparqlResutlSet or IGraph something went wrong
            //but didn't throw an exception so you should handle it here
            Console.WriteLine("ERROR");
        }
    }
    catch (VDS.RDF.Query.RdfQueryException queryEx)
    {
        //There was an error executing the query so handle it here
        Console.WriteLine(queryEx.Message);
    }