ASP.NET: Dynamically set Text and Value fields for

2024-07-10 13:08:09

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this code was written in response to a message posted on one of charles carroll's asp.net lists. you can sign up for one or all of the lists here.
code:

<%@ page language="vb" %>
<%@ import namespace="system.data" %>
<%@ import namespace="system.data.sqlclient" %>
<html>
<script language="vb" runat="server">
    sub page_load(sender as object, e as eventargs)
    if not ispostback then
           dropdownlist1.datatextfield = "pub_name"
       dropdownlist1.datavaluefield = "pub_id"
       bindlist
        end if
    end sub

    sub buttonclick(sender as object, e as eventargs)
    if sender.id = "button1" then
       dropdownlist1.datatextfield = "pub_id"
       dropdownlist1.datavaluefield = "pub_name"
    else
           dropdownlist1.datatextfield = "pub_name"
       dropdownlist1.datavaluefield = "pub_id"
    end if

    bindlist

    button1.visible = "false"
    button2.visible = "true"
    end sub

    sub bindlist()
    dim myconnection as sqlconnection = new sqlconnection("data source=(local)/netsdk; trusted_connection=yes; initial catalog=pubs")

    dim mycommand as sqlcommand = new sqlcommand("select pub_id, pub_name from publishers", myconnection)

    myconnection.open()

    dropdownlist1.datasource = mycommand.executereader(commandbehavior.closeconnection)
        dropdownlist1.databind()

        dropdownlist1.items.insert(0, "select an item")
    dropdownlist1.selectedindex = 0
    end sub

</script>
<body>
<form runat="server">
<asp:dropdownlist id="dropdownlist1" runat="server" />
<asp:button id="button1" text="switch em" onclick="buttonclick" runat="server" />
<asp:button id="button2" text="switch em back" onclick="buttonclick" visible="false" runat="server" />
</form>
</body>
</html>