Question

I currently developing a webpage using C#. I have a DropdownList data bound with the data from my sql database. After the dropdownlist bind with my database, the item inside the dropdownlist are userA, userB, and userC. If i select any of the item inside the dropdownlist, the data of the particular user will show in the gridview.

So, what I am trying to do now is I want to add an ALL into the dropdownlist. When I click on the ALL, the data of each user will be shown in the gridview. How can I achieve that? Any advice? Thanks.

P/S: I dont want to add any extra button in order to show all the user data. I want to make it in the dropdownlist.

This is my code:

WebApp.aspx:

<asp:DropDownList ID="DropDownList1" runat="server" 
        DataSourceID="SqlDataSource1" DataTextField="Username" 
        DataValueField="Username">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:DBConnectionString %>" 
        SelectCommand="SELECT [Username] FROM [Accounts]">
</asp:SqlDataSource>

This is what i have edited for a new Webpage. I do not call the data binding function in code behind.

Thanks for any helps.

This is the answer i am looking for:

<asp:DropDownList ID="DropDownList1" runat="server" 
        DataSourceID="SqlDataSource1" DataTextField="Username" 
        DataValueField="Username" AppendDataBoundItems="True">
    <asp:ListItem Text="All" Value ="all" Selected="True"></asp:ListItem>
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:DBConnectionString %>" 
        SelectCommand="SELECT [Username] FROM [Accounts]">
</asp:SqlDataSource>

Thanks everyone who is trying to help me.

Answer 1

You can achieve this:

Use this code after you bind the DropdownList with SQL data

ddlUsers.Items.Add(new ListItem("All", "all"));
ddlUsers.SelectedValue = "all";

Once this is done, you can make your select all user query based on this condition:

if(ddlUsers.SelectedValue == "all")
{
   // your SQL query to select all users goes here.
}

In HTML Markup you can add this like:

<asp:DropDownList ID="DropDownList1" runat="server" 
        DataSourceID="SqlDataSource1" DataTextField="Username" 
        DataValueField="Username">

<asp:ListItem Text="All" Value ="all" Selected="True"></asp:ListItem>

</asp:DropDownList>

You can remove Selected="True" if you don’t want this to be selected by default.