Since you haven't specified where you need this kind of functionality (like in a WebPart or an Application Page etc), it's difficult to assume whether the Server Object Model or the Client Object Model should be used.
Here is a small code snippet which uses the Server Object Model.
SPWeb topLevelWeb;
SPWeb childWeb1, childWeb2;
SPWebCollection sites1, sites2;
public void DeleteThisFunction()
{
topLevelWeb = new SPSite("http://toplevelsiteurl").OpenWeb();
sites1 = topLevelWeb.Webs;
foreach (SPWeb item in sites1)
{
dropDown1.Items.Add(item.Title);
}
}
void dropDown1_SelectedIndexChanged(object sender, EventArgs e)
{
childWeb1 = sites1[dropDown1.SelectedIndex];
sites2 = childWeb1.Webs;
foreach (SPWeb item in sites2)
{
dropDown2.Items.Add(item.Title);
}
}
void dropDown2_SelectedIndexChanged(object sender, EventArgs e)
{
childWeb2 = sites2[dropDown2.SelectedIndex];
SPListCollection lists = childWeb2.Lists;
foreach (SPList item in lists)
{
dropDown3.Items.Add(item.Title);
}
}
Regards,
Nauzad Kapadia
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