How to filter dropdown list values by another dropdown list in ASP.NET, c#

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独厮守ぢ
独厮守ぢ 2021-01-12 15:58

I have a simple question about filters. I have 4 dropdown lists which filter the data in my web application from MySQL database table. The first dropdown list is already sel

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  • 2021-01-12 16:13

    check out following links for populating cascading drop down list.

    http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/CascadingDropDown/CascadingDropDown.aspx

    http://www.codeproject.com/KB/aspnet/CascadingDropDown.aspx

    http://www.aspsnippets.com/Articles/Creating-Cascading-DropDownLists-in-ASP.Net.aspx

    Code:

    <table>
        <tr>
            <td>First</td>
            <td><asp:DropDownList ID="DDLFirst" runat="server"  AutoPostBack="true"
                    onselectedindexchanged="DDLFirst_SelectedIndexChanged"></asp:DropDownList></td>
        </tr>
        <tr>
            <td>Secord</td>
            <td><asp:DropDownList ID="DDLSecond" runat="server" AutoPostBack="true"
                    onselectedindexchanged="DDLSecond_SelectedIndexChanged">
                <asp:ListItem Text="Select" Value="Select"></asp:ListItem>    
                </asp:DropDownList></td>
        </tr>
        <tr>
            <td>Thrid</td>
            <td><asp:DropDownList ID="DDLThird" runat="server"><asp:ListItem Text="Select" Value="Select"></asp:ListItem>    </asp:DropDownList></td>
        </tr>
    </table>
    

    // Code behind protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { // your code to bind the first drop downlist

            }
        }
    
        protected void DDLFirst_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DDLFirst.SelectedIndex > 0)
            {
                string FirstDDLValue = DDLFirst.SelectedItem.Value;
                // below your code to get the second drop down list value filtered on first selection
    
    
            }
    
        }
    
        protected void DDLSecond_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (DDLSecond.SelectedIndex > 0)
            {
                string SecondDDLValue = DDLSecond.SelectedItem.Value;
                // below your code to get the third drop down list value filtered on Second selection
    
    
            }
        }
    
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  • 2021-01-12 16:22

    Filter the second dropdown datasource with selectedvalue of first dropdown control

    see this article http://www.asp.net/data-access/tutorials/master-detail-filtering-with-two-dropdownlists-

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