Filter dropdownlist and display message box

[jue]

Hi evryone ..
i've problem here...please someone help me
i 've dropdownlist and when user select item in dropdownlist error message will display "Please select another item, this item already use".
This message it can be a pop up message or just use the label.

Please help me..it's urgent

 

[jmcilhinney]

Is this an ASP.NET DropDownList or is it actually a ComboBox?

 

[jue]

it same...in vb.net it call dropdownlist..i think it same. please help me.

 

[jmcilhinney]

No it's not the same, otherwise I wouldn't have asked the question. I'm trying to help but you aren't making it very easy. If you are creating a WinForms app then you would be using a System.Windows.Forms.ComboBox, but if you are creating a WebForms app then you would be using a System.Web.UI.WebControls.DropDownList. They perform a similar function but they certainly not the same thing. They do, however, have some equivalent functionality. They both have a SelectedIndexChanged event, in the handler for which you can test the SelectedItem and if appropriate display the message.

I'm also concerned with moving your thread to the appropriate forum
so please answer my question.