asp.net - Load DropDownList from Database, then get the Value -


i'm not sure how asp.net works since i'm still new it, coming php background things done post. i'm using vb.net behind code. because main program used here written in vb.net , want keep code portable without compiling library.

my issue follows. have dropdownlist on page. populate data database. seems work fine.

i have button should change clientcode whatever has been selected in dropdownbox. doesn't work. instead index -1.

page code

<%@ page title="" language="vb" autoeventwireup="false" masterpagefile="~/masterpage.master" codebehind="admin.aspx.vb" inherits="wotc_cp.admin" %> <asp:content id="content1" contentplaceholderid="head" runat="server"> </asp:content> <asp:content id="content2" contentplaceholderid="rightbody" runat="server">    <%         load_userlist_list() %> <h1 class="sub-header">administration toolbox</h1> <p>if not administrator, please send alert , leave page @ once.</p> <div class="row">     <div class="form-group">         <div class="col-md-4">             <asp:label id="label1" runat="server" text="label">change clientcode;</asp:label>             <asp:dropdownlist id="cboclientlist" class="form-control" runat="server" >              </asp:dropdownlist>             <asp:button id="cmdchangeclientcode" class="btn btn-primary" runat="server" text="change"  />           </div>     </div> </div>

behind code

public sub load_clientcode_list()     if ispostback = false         using db new wotcdb             dim r = (from t in db.client_main order t.clientcode select t.clientcode).distinct             each client in r                 dim input new listitem                 input.text = client                 input.value = client                 cboclientlist.items.add(input)             next         end using     end if end sub  private sub cmdchangeclientcode_click(sender object, e eventargs) handles cmdchangeclientcode.click     dim clientcode string = ctype(session("clientcode"), string)     dim username string = ctype(session("username"), string)     using db new wotcdb         dim u = (from t in db.website_users t.username = username).firstordefault         if u isnot nothing             dim tempid integer = cboclientlist.selectedindex             dim tempvalue string = cboclientlist.selectedvalue             u.clientcode = cboclientlist.selectedvalue             db.savechanges()         end if     end using end sub

i've tried other answers here on stack, nothing seems work. ideas?

in asp.net dropdown list has 2 key properties want set. datatextfield = display name , datavaluefield = value store db. said, need capture "selectedvalue" if want datavaluefield.


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