Here is a method from msdn to provide data to an autocomplete extender / textbox:

  <System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()> _
    Public Shared Function GetCompletionList(ByVal prefixText As String, ByVal count As Integer, ByVal contextKey As String) As String()
        ' Create array of movies
        Dim movies() As String = {"Star Wars", "Star Trek", "Superman", "Memento", "Shrek", "Shrek II"}

        ' Return matching movies
        Return From m In movies(6) Where _
               (m.StartsWith(prefixText, StringComparison.CurrentCultureIgnoreCase))
        Select m).Take(count).ToArray()

    End Function

The errors are:

m.StartsWith - ('Startswith' is not a member of 'Char')

Select m - ('Select Case' must end with a matching end select)

.Take(count).ToArray() - (End of statement expected)

Can you please let me know how to get this function working? Thanks