How to implement auto complete textbox using Entity and Linq

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I am using entity framework in my application in that i autocomplete textbox using linq . In debug mode it retrive value but in page city name not display.Am i doing something wrong?

XML

[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> GetSuggessions(string prefixText, int count, string contextKey)
{
  
     List<string> res = MasterDTO.GetCities(21).Select(s => s.CityName).ToList();
    List<string> suggestions = res
  .Where(a => a.StartsWith(prefixText))
  .Take(count)
  .ToList();
    // contextKey can be used to set further filter
    return suggestions;
}

XML

<asp:ScriptManager ID="ScriptManager2" EnablePageMethods ="true" runat="server" />

   <asp:TextBox ID="txtAutoComplete" runat="server"  ></asp:TextBox>
       <ajax:AutoCompleteExtender   ID="AutoCompleteExtender1"    runat="server" TargetControlID="txtAutoComplete"  runat="server"  MinimumPrefixLength="1"
       EnableCaching="true"
       CompletionInterval="100"
       ServiceMethod="GetSuggessions"
       CompletionSetCount="20"
       ContextKey="strOtherPram">
       </ajax:AutoCompleteExtender>

Posted 1-Apr-13 19:55pm

Manohar Khillare

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*Karthik Harve* · Answer 1 · 2013-04-01T20:08:00

Hi,

try like below.

C#

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public string[] GetSuggessions(string prefixText, int count, string contextKey)
{
  
    List<string> res = MasterDTO.GetCities(21).Select(s => s.CityName).ToList();
    string[] suggestions = res.Where(a => a.StartsWith(prefixText)).ToList().ToArray();
    // contextKey can be used to set further filter
    return suggestions;
}

because, the web method signature, should be like below.

C#

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod]
public string[] GetSuggessions(
    string prefixText, int count, string contextKey) { ... }

the function should return string array.

refer AutoComplete Demonstration[^] for more