asp.net - Making changes to a pre-populated textbox -

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i have following webform textboxes pre-populated on page load:

<%@ page title="" language="vb" masterpagefile="~/default.master" autoeventwireup="true" codefile="admin.aspx.vb" inherits="admin" theme="g2m" %>  <asp:content id="content1" contentplaceholderid="head" runat="server"> </asp:content> <asp:content id="content2" contentplaceholderid="contentplaceholder1" runat="server">         <form id="form1" runat="server">             <label>username: </label>             <asp:textbox id="textbox1" runat="server"></asp:textbox>             <br />             <label>password: </label>             <asp:textbox id="textbox2" runat="server"></asp:textbox>             <br />             <label>product type: </label>             <asp:textbox id="textbox3" runat="server"></asp:textbox>             <br />             <label>smtp default only: </label>             <asp:textbox id="textbox4" runat="server"></asp:textbox>             <br />             <label>logo: </label>             <asp:textbox id="textbox5" runat="server"></asp:textbox>             <br />             <asp:button id="submit" text="submit changes" runat="server" onclick="submitchanges" />         </form> </asp:content>

and codebehind follows:

    protected sub page_load(byval sender object, byval e system.eventargs) handles me.load             dim xmldoc new xmldocument             xmldoc.load(server.mappath("~/xml_config/config.xml"))             dim configvalues xmlparser = new xmlparser(xmldoc) ''instantiate xmlparser              ''populate textboxes xml data             textbox1.text = configvalues.username             textbox2.text = configvalues.password             textbox3.text = configvalues.producttype             textbox4.text = configvalues.smtpdefaultonly             textbox5.text = configvalues.logo         end sub  public sub submitchanges(byval sender object, byval e system.eventargs)         dim xmldoc new xmldocument         xmldoc.load(server.mappath("~/xml_config/config.xml"))         dim configvalues xmlparser = new xmlparser(xmldoc) ''instantiate xmlparser           configvalues.smtpdefaultonly = textbox4.text     end sub

all i'm trying make values editable when form presented user, can change values , submit them file. problem when submitchanges function called, though change value of textbox, still same. how pass new value, typed thetextbox, function?

enclose setter in if not ispostback in page load. it's overwriting boxes.


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