Drop Down List Populated Depending Upon the value Selected in another Drop Down List


I have five drop down lists.Each One populated based on the value selected in the previious one.

I have used SqlDataSource for binding data to each drop down.And I need some initial value so I put "AppendDataBoundItems" as true.Functionality is ok.

The problem is,

I have selected one from first dropdown.then second drop down is populated.but now i want to select a different value from first dropdown.If i do so,To my second drop down list the values r being appended.not refreshed.I think this is because AppendDataBoundItems=true

Plz suggest me something.

Thanks in Advance. 

Im novice to .net and been exploring .net these days

8/28/2007 10:12:08 AM
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clear your second dropdown before binding.. so it will bind only new values only not appending to the prevouse one..

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8/28/2007 12:13:40 PM


But how. Is there any property to clear a drop down before data binding,I couldnt found such thing.

If so plz help me.

8/28/2007 12:54:19 PM

Do i need to do it manually.

Like On SelectIndexChanged or something,i have to clear and i have to add the default item(initial value).

Is there any other way.

I have searched but i couldnt find.


8/28/2007 1:21:59 PM

DropDownList1.Items.Clear(); will clear the items. You can add the inital item in the DataBound event of the drop down DropDownList1.Items.Insert(0, new ListItem("Select", "Select"));

Thank you,
John M. Perry
8/28/2007 1:25:36 PM


Thanks. i did it. But not on DataBound Event.On SelectIndexChanged for previous drop down. and i have "AppendDataBoundItems"=true. for adding static item in DropDownList.So i can have the default item every time.

It is like,

protected void CategoryDropDown_SelectedIndexChanged(object sender, EventArgs e)



new ListItem("Select Release Number", "0"));                     --DropDownList1


protected void ReleaseDropDown_SelectedIndexChanged(object sender, EventArgs e)


ApplicationDropDown.Items.Clear();                                                                                    --DropDownList2

new ListItem("Select Application", "0"));



I have 5 drop downs like this.

Thanks once again.

8/29/2007 5:04:05 AM

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