asp.net - store submission form content into pending xml file -

i have existing xml file want use store contents of submission form.

/**** xml file storeuserinfo.xml:

<?xml version="1.0" encoding="utf-8" ?> <recordstore>  </recordstore> 

/****** form

<div>genre: <asp:textbox id="txtgenre" runat="server" /></div><br />         <div>title: <asp:textbox id="txttitle" runat="server" /></div><br />         <div>name: <asp:textbox id="txtname" runat="server" /></div><br />         <div>email: <asp:textbox id="txtemail" runat="server" /></div><br />         <div>comments: <br /><asp:textbox id="txtcomment" runat="server" width="200px" height="100px" /></div><br />         <div><asp:button id="btnsubmit" runat="server" text="submit"                  onclick="btnsubmit_click" /></div><br />         <div>             <asp:label id="lblresult" runat="server" />         </div> 

/********** source code

//function create nodes     xmlnode createbooknode(xmldocument doc)     {         //create author node , children         xmlnode recordnode = doc.createelement("record");           xmlattribute genreattribute = doc.createattribute("genre");         genreattribute.value = txtgenre.text;         recordnode.attributes.append(genreattribute);          //create title attribute , add children of record node         xmlnode titlenode = doc.createelement("title");         titlenode.innertext = txttitle.text;         recordnode.appendchild(titlenode);          //create author node , it's children         xmlnode authornode = doc.createelement("author");         xmlnode fullnamenode = doc.createelement("fullname");         fullnamenode.innertext = txtname.text;         authornode.appendchild(fullnamenode);           //now add email          xmlnode emailnode = doc.createelement("email");         emailnode.innertext = txtemail.text;         authornode.appendchild(emailnode);            recordnode.appendchild(authornode);           //now add comments         xmlnode commentnode = doc.createelement("comments");         commentnode.innertext = txtcomment.text;         recordnode.appendchild(commentnode);          return recordnode;     }      //button click     protected void btnsubmit_click(object sender, eventargs e)     {         //path xml file         string xmlpath = mappath("storeuserinfo.xml");         xmldocument doc = new xmldocument();          doc.load(xmlpath);         xmlnode recordnode = createbooknode(doc);          //get reference book node , append book node         xmlnode recordstorenode = doc.selectsinglenode("recordstore");          recordstorenode.appendchild(recordnode);                      lblresult.text = "xml document has been updated";     } 

... i'm not getting errors, form fails write contents of form xml file when button clicked. provides assistance i'm missing?

i got working; btnsubmit_click function missing doc.save(xmlpath);