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Hi!
How can I add child list items to a parent list item in a dropdown list in ASP.net without using a database?

Thanks in advance!
Posted
Updated 27-Feb-11 22:22pm
v2
Comments
Albin Abel 28-Feb-11 4:20am
   
Treeview would be better in this case. There are ways you can display the list hierarchial. But it is not like you select a child and other childs will be shown
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Solution 2

You can't have a Parent list item and Child list items in a drop down like this:
Parent1
   Child 1
   Child 2
Parent 2
   Child 3
      Child 4
      Child 5
   Child 6
Drop down just doesn't work like that - it only supports a single level:
Item 1
Item 2
Item 3

Instead, consider a TreeView (if you need a truly hierarchical list) or use two drop downs if you only need one level. When the first changes, it alters the content of the second.
   
Comments
arindamrudra 28-Feb-11 4:46am
   
But still if he want to display like the first one, then he should have to write a query which returns value like Parent1--Child1.1----Child1.1.1--Child1.2. But you are not using database. If it is coming from XML file then also you can do this.
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Solution 1

this[^] might help you.
   
Comments
Manfred Rudolf Bihy 28-Feb-11 4:24am
   
I'm not sure why this was downvoted. Compensated 5+
[no name] 28-Feb-11 4:26am
   
Thanks manfred. there are lot of univoters are playing around.
arindamrudra 28-Feb-11 4:37am
   
I think he was looking for the Griff's answer.
[no name] 28-Feb-11 4:46am
   
I too thinks the same.
arindamrudra 28-Feb-11 4:49am
   
Please check my comment on Griff's answer.
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Solution 3

public partial class Default : System.Web.UI.Page
{
    // First DropdownList items
    protected string[] Movies ={ "select a movie", "Movie_1", "Movie_2", "Movie_3" };
    // Second DropdownList items. One among these to be choosen.
    protected string[] Movie_1={"Theatre_1","Theatre_2","Theatre_3"};
    protected string[] Movie_2 ={ "Theatre_4", "Theatre_5" };
    protected string[] Movie_3 ={ "Theatre_5", "Theatre_6", "Theatre_7" };
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DropDownList1.DataSource = Movies;
            DropDownList1.DataBind();
        }
    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList1.SelectedIndex == 1)
        {
            DropDownList2.DataSource = Movie_1;
            DropDownList2.DataBind();
        }
        if (DropDownList1.SelectedIndex == 2)
        {
            DropDownList2.DataSource = Movie_2;
            DropDownList2.DataBind();
        }
        if (DropDownList1.SelectedIndex == 3)
        {
            DropDownList2.DataSource = Movie_3;
            DropDownList2.DataBind();
        }
    }
}
   
v2

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