edit or update to xml file

[yemen2007]

hi

i have some problem in my project i want help . the problem it is update or edit to the file in xml.my project is write and update/edit to xml file. i done the first one is write bout i have problem in the update/edit function . i write some value inside file
i want change the value that one in the file. i use c# so could u plz help me in this function. this the code for write :


XmlTextWriter f = new XmlTextWriter(" website creator.xml", null);
f.WriteStartDoc ument();
f.WriteComment( "Comment For my XML File");
f.WriteStartEle ment("", "site title", "");
f.WriteString(t his.textBox1.Te xt.ToString());
//f.WriteEndEleme nt();
f.WriteStartEle ment("", "webmaster name", "");
f.WriteString(t his.textBox3.Te xt.ToString());
f.WriteStartEle ment("", "webmaster email", "");
f.WriteString(t his.textBox2.Te xt.ToString());
f.WriteStartEle ment("", "no page", "");
f.WriteString(t his.comboBox1.T ext.ToString()) ;
f.WriteStartEle ment("", "Template", "");
f.WriteString(t his.radioButton 1.Text.ToString ());
f.WriteStartEle ment("", "Template", "");
f.WriteString(t his.radioButton 2.Text.ToString ());

f.WriteEndEleme nt();
f.WriteEndDocum ent();
Form6 m = new Form6();
m.Show();
f.Close();