asp.net Validation on DropDownList box

I have a dropdownlist (cboViewAlbums) which has displays album values. The first item is a Please select an album.... I am trying to use validation which when lb_create_album linkButton is clicked throws an error if the cboViewAlbums list has the value 0 selected. Below is the code for the this and my attempt:

<asp:DropDownList ID="cboViewAlbums" runat="server" 
         DataSourceID="SqlDataSource1" DataTextField="album_name" 
         DataValueField="album_id" Width="250px" AutoPostBack="True" AppendDataBoundItems="true">
         <asp:ListItem Value="0">Please select an album...</asp:ListItem>
         </asp:DropDownList>
    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&开发者_开发问答amp;nbsp;&nbsp;&nbsp;&nbsp;
     <asp:LinkButton ID="lb_create_album" runat="server">Create Album</asp:LinkButton>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:fpaConnectionString %>"
        SelectCommand="SELECT [album_id], [album_name] FROM [fpa_albums] ORDER BY [album_name]">
    </asp:SqlDataSource>
     <br />
     <asp:HyperLink CssClass="example7" ID="hLinkUploadPhotos" NavigateUrl="multiple_upload.aspx" runat="server">Upload Multiple Photos</asp:HyperLink>
     <br />
     <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
         ControlToValidate="cboViewAlbums" ErrorMessage="Please Select an Album" 
         InitialValue="Please select an album..."></asp:RequiredFieldValidator>

Any idea how I can get this working?

Thanks

You have to use Range validator with dropdown list & set mininmum value greater then 0 & maximum value to set any max value , aslo provide type value of min & max and that is integer.

Below is the sample code i have make for you you have to bind your datasource insted of static list items.

<asp:DropDownList runat="server" ID="ddl1" >
        <asp:ListItem Value="0" Text="Select value" />
        <asp:ListItem Value="1" Text="text1" />
        <asp:ListItem Value="2" Text="text2" />
    </asp:DropDownList>
    <asp:RangeValidator ErrorMessage="Please select value" ControlToValidate="ddl1" runat="server"
        MinimumValue="1" MaximumValue="100000000" Type=Integer />
    <asp:Button Text="text" runat="server"  />

If this helpful to you please mark as an answer

Thanks

Arun

First, you can't do validation with HyperLink, better use the LinkButton. HyperLink does not do post back, so that's your first error. Second, on your RequiredFieldValidator, put the initialvalue=0, and that should fix your problem.

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
     ControlToValidate="cboViewAlbums" ErrorMessage="Please Select an Album" 
     InitialValue="0"></asp:RequiredFieldValidator>