title: .net rdf dblp dataset querying
body: <p>when i run the following code to query the dblp dataset using this code snippet
  i am using this endpoint <a href="http://dblp.l3s.de/d2r/snorql" rel="nofollow">http://dblp.l3s.de/d2r/snorql</a>
   <code>enter code here</code>String st = "";
          String qry = "";
          String uri_V;</p>
  
  <pre><code>    uri_V = "http://dblp.l3s.de/d2r/sparql";
  
  
  
      // Modify if need......
      //String ns = "\""+TextBox1.Text.ToString()+"\"";
      // String qry = "SELECT DISTINCT ?name WHERE { ?person foaf:name ?name.FILTER regex(str(?name),"+ns+").}";
      if (radiosrch.SelectedIndex == 0)
      {
          qry = "SELECT ?title WHERE {?game &lt;http://purl.org/dc/terms/subject&gt; &lt;http://dbpedia.org/resource/Category:First-person_shooters&gt; .?game foaf:name ?title .}ORDER by ?title";
      }
      else// if (radiosrch.SelectedIndex == 1) 
      {
          // qry= "query for publisher."
          qry = "SELECT DISTINCT ?Concept WHERE {[] a ?Concept} LIMIT 10";
      }
  
  
      //Common
      SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri(uri_V));
      SparqlResultSet results = endpoint.QueryWithResultSet(qry);
      foreach (SparqlResult result in results)
      {
          Console.WriteLine(result.ToString());
          st = st + result.ToString() + "\n";
      }
      TextBox3.Text = st.ToString();
  }
  catch (Exception ex)
  {
      Label1.Visible = true;
      Label1.Text = ex.ToString();
  }
  </code></pre>
  
  <p>I get the following error</p>
  
  <p>VDS.RDF.Query.RdfQueryException: A HTTP Error occurred while trying to make the SPARQL Query, see inner exception for details ---> System.Net.WebException: The remote server returned an error: (400) Bad Request. at System.Net.HttpWebRequest.GetResponse() at VDS.RDF.Query.SparqlRemoteEndpoint.ExecuteQuery(Uri target, String postData, String accept) at VDS.RDF.Query.SparqlRemoteEndpoint.QueryInternal(String sparqlQuery, String acceptHeader) at VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet(ISparqlResultsHandler handler, String sparqlQuery) --- End of inner exception stack trace --- at VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet(ISparqlResultsHandler handler, String sparqlQuery) at VDS.RDF.Query.SparqlRemoteEndpoint.QueryWithResultSet(String sparqlQuery) at Index.ImageButton1_Click(Object sender, ImageClickEventArgs e) in d:\SPARQL\Index.aspx.cs:line 48</p>
  
  <p>Plz help me resolve ASAP,plz</p>