how to fill a combobox based on selected value of another combobox

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I want to use two comboboxes.
Both combobox data fill from database.

I want second combobox to populate based on selected value from the first combobox.

Please give proper code.

Posted 7-Sep-10 22:24pm

amitthakkar1987

Updated 7-Sep-10 22:42pm

Dalek Dave

v2

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Dalek Dave 8-Sep-10 4:42am

Edited for Grammar and Syntax.

Toli Cuturicu 8-Sep-10 7:14am

Reason for my vote of 1
Don't ask for code! Show us what you've done and is not working as expected!

2 solutions

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LNogueira · Answer 1 · 2010-09-07T22:34:00

On selectedItemChanged event of the first you load the values of the second combo, using the selectedValue of the first as parameter to your database call.

Ex:

C#

protected void ddlCity_SelectedIndexChanged(object sender, System.EventArgs e)
{
    
        ddlStreet.DataSource = Dal.GetStreetsByCity(ddlCity.SelectedItem.Text);
        ddlStreet.DataTextField = "streetName";
        ddlStreet.DataValueField = "idStreet";
        ddlStreet.DataBind();
        
    }
}

CPallini · Answer 2 · 2010-09-07T22:38:00

Solution 2

Krauze wrote:
pls give proper code...

Please don't ask for ready-to-run code.

The ComboBox class has all you need and MSDN provides full documentation (see, for instance, the example in ComboBox Class[^] overview).

:)

Posted 7-Sep-10 22:38pm

CPallini

Updated 7-Sep-10 22:39pm

v2