How to get particular item in list in c#?

 

   <asp:DropDownList ID="DropDownList1" runat="server">

        <asp:ListItem>Enable</asp:ListItem>

        <asp:ListItem>Disable</asp:ListItem>

    </asp:DropDownList>

    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />

   protected void Button1_Click(object sender, EventArgs e)

    {

        if (DropDownList1.SelectedItem.Text == "Enable")

            DropDownList1.SelectedIndex = 1;

        else

            DropDownList1.SelectedIndex = 0;

    }