Add new row in xml file using asp.net c#

Question

Hello.

 

I am trying to add new row in xml file but my code is not working can any guide me about my  code?

 

my back end code is: 

 

DataSet Xds = new DataSet();

Xds.ReadXml(Server.MapPath("~/Student_ExamPaper_xml/" + Student_Question_paper_xml + ".xml"));

DataRow Xrow = Xds.Tables[0].NewRow();

Xrow["Question_ID"] = "Question_" + question_id;

Xrow["Question_detail"] = Question_detail.Text;

Xrow["Option_1"] = Question_detail.Text;

Xrow["Option_2"] = Question_detail.Text;

Xrow["Option_3"] = Question_detail.Text;

Xrow["Option_4"] = Question_detail.Text;

Xrow["Radion_Button_index"] = Question_detail.Text;

Xds.Tables[0].Rows.Add(Xrow);

Xds.AcceptChanges();

Xds.WriteXml(Server.MapPath("~/Student_ExamPaper_xml/" + Student_Question_paper_xml + ".xml"));

 

 

and xml fomrat:

 

<Questions>

<Question_1>

<Question_ID>1</Question_ID>

<Question_Detail>What is the capital of INDIA?</Question_Detail>

<Option_1>Mumbai</Option_1>

<Option_2>Ranchi</Option_2>

<Option_3>Delhi</Option_3>

<Option_4>Kanpur</Option_4>

<Radion_Button_index>-1</Radion_Button_index>

</Question_1>

</Questions>

 

 

Please Guide me.... thanks in advance