Deriving new event handler for onselectionchanged

[G S S]

Hi,

I am designing an RSS Feed reader using a RAD Grid and RAD Combo box.

My combo box will list all the sites whose feeds I subscribe to (e.g. this site, MSDN, etc etc).

On the selection of a feed, I want to fire an event handler (implemented) but I want to get the corresponding feed URL of a site title (using my dictionary collection in C#).

However, you cannot add new parameters to an event handler unless you override it.

This raises confusion for me. I have an event which is derived from RADComboBox... (can't remember exact name), and I've added the extra field in the derived constructor.

However, when I call the event handler at onSelectionChanged, I get this error:

Error 5 No overload for 'NewEventHandler' matches delegate 'Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventHandler' 

Code:

public class NewEventHandler : Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs
{
public string Url;

public NewEventHandler(string text, string oldtext, string value, string oldValue, string Url) : base(text, oldtext, value, oldValue)
{
}
}

I then call this event handler on the appropriate/relevant event, and pass in the parameters in the constructor of the event handler, like so:

  onselectedindexchanged="NewEventHandler"

  protected void NewEventHandler(object o, Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs e, string Url)
{

What am I doing wrong?

Thanks

[Atanas Korchev]

Hello G S S,

You cannot assign your type of event handler to the SelectedIndexChanged event as they are of different type. What you should do is expose a new event by inheriting from RadComboBox. Then subscribe to the OnSelectedIndexChanged event and raise your event there.

Regards,
Albert
the Telerik team

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[G S S]

Is there an example of this (Either in general ASP.NET or in specific to rad controls)?

I ask, because I don't have much experience modifying event functionality.

Thanks

[Atanas Korchev]

Hello G,

I have attached a sample web site which demonstrates the required approach.

I hope this helps,
Albert
the Telerik team

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[G S S]

Thanks for that :)