XML Writer (Need to store the xml file as specified by the user ie.. user selected path)

Question

Hi, I have designed one module using asp.net and c#, such that user can input details in the page.. After inputting he clicks the submit button, an xml file is generated related to the input given,... I used XmlTextWriter to create xml document.. i used XmlTextWriter XMLWriter = new XmlTextWriter("C://TestXml.xml", null); to store the document... But i need that xml file to be stored in the specified path as selected by the user... How can i achieve this. Please help me.. I need it to be completed by today... Thank You, Regards, Saravanan.M