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ASP.NET - Textbox AutoComplete Feature using VB.NET

The entire internet world is now moving towards the AJAX and related features. In another one or two years there won't be much web sites without the features of AJAX. One of the most respected feature of AJAX Control Extension kit is the Autocompletion feature. But it is not much difficulty to get this result.

We need to use the following procedure:

Make sure you have added the Script Manager from the Ajax into you form.
Put a textbox in it.
From the Ajax Control Extension tools, drag and drop the Autocomplete extender.
Set the TargetControlID of the AutocompleteExtender control like the following.
Right click on the website name and choose the Add Item... option.
Choose the Webservice, give the name Myservice.vb

Go to the Codeview of the MyService and make sure the following code is added. Please note the highlighted lines.

Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols

<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
<System.Web.Script.Services.ScriptService()> _
Public Class MyService
    Inherits System.Web.Services.WebService

    <WebMethod()> _
    Public Function HelloWorld() As String
        Return "Hello World"
    End Function

    <WebMethod()> _
    Public Function GetRandomList(ByVal prefixText As String, _
                   ByVal count As Int16) As String()
        Dim S(count - 1) As String

        Randomize(Now.Ticks)
        Dim I As Integer
        For I = 0 To count - 1
            S(I) = prefixText & CDec(Rnd() * 100000.0#)
        Next
        Return S
    End Function

End Class

Now choose the textbox and enter the properties as shown here.
Run to view the result.

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