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filter dropdownlist/sqldatasource

Posted By:      Posted Date: September 27, 2010    Points: 0   Category :ASP.Net

DISCLAIMER: I am very new to asp.net

I am working on a webform that allows users to access information from a database of algae species.  I have a drop down list of all algae genera for the user to chose from.  I would also like to have a check box that would allow the user to filter the drop down list so that it only shows diatom genera (diatoms are a type of algae).

Below is code that I thought should work, however checking the checkbox seems to have no effect :(

Any help would be greatly appreciated!


<script runat="server">
    Sub Page_Load()
        If chkDiatoms.Checked Then
            dsGenusList.FilterExpression = "is_diatom = 1"
            dsGenusList.FilterExpression = ""
        End If
    End Sub

<form runat="server">
<asp:CheckBox id="chkDiatoms" text="Diatoms Only" runat="server" AutoPostBack="True"/> <br>
<asp:DropDownList ID="ddlGenus" runat="server" dataSourceID="dsGenusList" dataTextField="genus"> </asp:DropDownList>
<asp:SqlDataSource ID="dsGenusList" runat=&q

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