How to cascade dropdown list boxes in ASP.NET

[easterbell]

I am working on a web application in ASP.NET(uses C# language) that consist of using cascading dropdown listboxes. Bascially, after the one item is selected out of the listbox, the next one should automatically display its drop down list. Could someone please help.

[axas]

• Set its PostBack property to true.
• Implement its SelectedIndexChanged Event

(C#)

DropDownList1_SelectedIndexChanged(object sender, DropDownListCommandEventArgs e)
{
    // here load the other dropdownlist items
}

(VB.NET)

Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As DropDownListCommandEventArgs) Handles DropDownList1.SelectedIndexChanged 
 
   'here load the other dropdownlist items
End Sub

[nmsreddi]

hi

for cascading the combo boxes first set the combo box property autopost back=true and then what ever the combos u want to cascade, write the second combo databind code in combo selected indexchange() ,i.e u can write code in what u get by doubleclicking the particular combobox.


hope u got it and may useful



nmsreddi

[bindu priya]

I am working on a web application in ASP.NET(uses C# language) that consist of using cascading dropdown listboxes. Bascially, after the one item is selected out of the listbox, the next one should automatically display its drop down list. Could someone please help.

Hi..
I'm working on a web application in ASP.Net(delphi language) that consists of loading the items to the dropdown list box in the form load event... then if any other event(say button click) is triggered the form load event is automatically called and so the item that i have selected before my event(button click) is changed because the form load event is agained called and so the item in the dropdown list is the first item (itam at form load). So i can't get the query to my selected item instead i'm always getting the query for the first item of the drop downlist box.Hope u people understood my problem.. and do help me i fu know the answer..