asp.net, c# autocomplete extender

Question

1) I have a textbox to enter initial letters of the item and, 2) a search button on click of which a listbox appears showing the matching searches. 3) I want to convert this into autocomplete extender and want to remove the listbox. Following is my code which I have tried:

    [System.Web.Script.Services.ScriptMethod()]
    [System.Web.Services.WebMethod]
    public List<string> OnSearchEntity(string prefixText, int count)
    {
        List<string> outsideEntities = new List<string>();
        DataTable dtOutsideEntity = COIOrganizationCollection.GetOrganizations(prefixText);

        for (int i = 0; i < dtOutsideEntity.Rows.Count; i++)
        {
            outsideEntities.Add(dtOutsideEntity.Rows[i]["Name"].ToString());
        }
        return outsideEntities;
    }

but it is showing an error:

Error 82 No overload for 'OnSearchEntity' matches delegate 'System.Web.UI.ImageClickEventHandler'

I have also tried changing the parameters, viz.

    public List<string> OnSearchEntity(object sender, ImageClickEventArgs e)
    {
        List<string> outsideEntities = new List<string>();
 DataTable dtOutsideEntity =COIOrganizationCollection.GetOrganizations(entityName.Text.Trim());

        for (int i = 0; i < dtOutsideEntity.Rows.Count; i++)
        {
            outsideEntities.Add(dtOutsideEntity.Rows[i]["Name"].ToString());
        }
        return outsideEntities;
    }

it again gives an error: Error 83 'System.Collections.Generic.List has the wrong return type

kindly help, or suggest the right way for this conversion.

control event has void return type,same lines of code in event can execute many times ,you can add parameters in it using lambda expression — Charlie, Sep 09 '14 at 06:32

score 0 · Accepted Answer · answered Sep 09 '14 at 06:42

0

Pass List of outsideEntities into the arguments using Lambda expression ,It will get changed automatically once event is fired. No need to return this list . You can use this example and change it for your event

    lnkSynEvent.Click += 
               new EventHandler((s,e)=>lnkSynEvent_Click(s, e, your_parameter));

Be careful same lines may get excecuted manytimes in event , even the event is fired just once

answered Sep 09 '14 at 06:42

Charlie

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this event doesn't have any definition for "click" – user3931799 Sep 09 '14 at 07:02
that is just example ..You have to use it as your requirement forexample Image.ImageClick+=new ImageClickEventHandler((s,e)=>OnSearchEntity(s,e,outsideEntities) – Charlie Sep 09 '14 at 07:06

score 0 · Answer 2 · answered Sep 09 '14 at 11:18

the error was because : i had used image button on click event, and for the same function i was using it for two different type of parameters,viz.

onsearch(sender, eventargs e), and onsearch(string a, int count)

in my case i could remove the button since i was converting it to autocomplete extender so search button was not required.

thank you for the help!

asp.net, c# autocomplete extender

2 Answers2