how to add item to dropdownList according to another dropdownList dynamiclly?

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Hi, I have 2 dropdown list in my website.
The ddlist_1 give Items from database at the time of loading page.
I want when the selected index of ddlist_1 changed, ddlist_2 get Item from database.(Asp.net & C#)

Posted 3-Nov-15 20:57pm

meliti

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Suvendu Shekhar Giri 4-Nov-15 3:05am

That's pretty simple. What have you tried so far?
Share the relevant code.

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Suvendu Shekhar Giri · Answer 1 · 2015-11-03T21:12:00

Follow these steps-
1. Make sure that following is set for ddlist_1

HTML

AutoPostBack="True"

2. In SelectedIndexChanged for ddllist_1 write the code to bind ddlist_2

C#

protected void ddllist_1_SelectedIndexChanged(object sender, EventArgs e)
{
    string selectedValue = ddllist_1.SelectedValue.ToString();
    //do the rest coding for binding ddllist_2
    //you have ddllist_1 selected value to filter if you need
}

Hope, it helps :)

Krunal Rohit · Answer 2 · 2015-11-03T21:05:00

That's cascading dropdowns.

Refer this,
http://www.aspsnippets.com/Articles/Creating-Cascading-DropDownLists-in-ASP.Net.aspx[^]
http://www.ajaxcontroltoolkit.com/CascadingDropDown/CascadingDropDown.aspx[^]
http://www.asp.net/web-forms/overview/ajax-control-toolkit/cascadingdropdown/using-cascadingdropdown-with-a-database-cs[^]

-KR

how to add item to dropdownList according to another dropdownList dynamiclly?

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