c# - Adding information to an already existing xml folder from a windows form -

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i trying store information writen form following code keeps happening override 1 there no add it. have following code xml serilaztion.

 xmlserializer xmlserializer = new xmlserializer((iclass.gettype()));  writer = new streamwriter(filename);  xmlserializer.serialize(writer, iclass);   creditcard cc = new creditcard(cardnumber, expirydate, creditcardtype);  user u = new user(name, surname, gender, posistion, wage, amount, banktype, cc, username, password);  xmlsave x = new xmlsave(u, "customers.xml");

i have try keep same format because school project.


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