I have a js code in which an array works well when its like
var availableTags = [
            "ActionScript",
            "AppleScript",
            "Asp",
            "BASIC",
            "C"
                     ];
I then made an array string in my code behind or .cs like on class level
 public static string[] test={"animal","lovely"};
I then changed js array to this
 var availableTags =  "<%=test%>"; // also tried without quotes 
Now I m not having the results as was having with previous js array
Editing with complete code,the jquery I taken from http://jqueryui.com/demos/autocomplete/#multiple
  using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
using System.Web.Script.Serialization;
public partial class onecol : System.Web.UI.Page
{
   JavaScriptSerializer serializer;
   public static string test = "['animal','lovely']";
    public static string check;
    protected void Page_Load(object sender, EventArgs e)
    {
       serializer = new JavaScriptSerializer();
        //serializer
        this.detail.ToolsFile = "BasicTools.xml";
        test = returnTitle();
    }
}
and the script with html is
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
<script type="text/javascript" src="Jscript.js"></script>  
     <script type="text/javascript" src="jquery-1.7.1.min.js"></script> 
     <script type="text/javascript" src="jquery-ui-1.8.17.custom.css"></script>  
     <link href="~/jquery-ui-1.8.17.custom.css" rel="stylesheet" type="text/css"/>
      <script type="text/javascript">
          $(function () {
                var availableTags =  <%=test%>;
              function split(val) {
                  return val.split(/,\s*/);
              }
              function extractLast(term) {
                  return split(term).pop();
              }
              $("#tags")
              // don't navigate away from the field on tab when selecting an item
            .bind("keydown", function (event) {
                if (event.keyCode === $.ui.keyCode.TAB &&
                        $(this).data("autocomplete").menu.active) {
                    event.preventDefault();
                }
            })
            .autocomplete({
                minLength: 0,
                source: function (request, response) {
                    // delegate back to autocomplete, but extract the last term
                    response($.ui.autocomplete.filter(
                        availableTags, extractLast(request.term)));
                },
                focus: function () {
                    // prevent value inserted on focus
                    return false;
                },
                select: function (event, ui) {
                    var terms = split(this.value);
                    // remove the current input
                    terms.pop();
                    // add the selected item
                    terms.push(ui.item.value);
                    // add placeholder to get the comma-and-space at the end
                    terms.push("");
                    this.value = terms.join(", ");
                    return false;
                }
            });
          });
    </script>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<div class="demo" >
<div class="ui-widget">
    <label for="tags">Tag programming languages: </label>
    <input id="Text1" class="#tags" size="50" />
</div>
</div>
actually its a auto complete functionality to give tags ,the auto complete suggestions for tagging I want to get from C# code ,I took Jquery source from jqueryui.com/demos/autocomplete/#multiple and then I tried to give it C# string from .cs file , I explained it with code on edited version , with C# code behind it works exactly as its in the link
An assignment operation assigns the value of the right-hand operand to the storage location named by the left-hand operand. Therefore, the left-hand operand of an assignment operation must be a modifiable l-value. After the assignment, an assignment expression has the value of the left operand but is not an l-value.
C has very little syntactical support for strings. There are no string operators (only char-array and char-pointer operators). You can't assign strings.
String assignment is performed using the = operator and copies the actual bytes of the string from the source operand up to and including the null byte to the variable on the left-hand side, which must be of type string. You can create a new variable of type string by assigning it an expression of type string.
+= Add AND assignment operator. It adds the right operand to the left operand and assign the result to the left operand. C += A is equivalent to C = C + A.
You need to serialize the C# string array into a javascript array.
http://msdn.microsoft.com/en-us/library/system.web.script.serialization.javascriptserializer.aspx
Usually I create a simple static class as a wrapper.
public static class JavaScript
{
    public static string Serialize(object o)
    {            
        JavaScriptSerializer js = new JavaScriptSerializer();
        return js.Serialize(o);
    }
}
Then you can use that class to serialize the item you need to
//C# Array(Member of asp page)
protected string[] Values = { "Sweet", "Awesome", "Cool" };
<script type="text/javascript">
    var testArray = <%=JavaScript.Serialize(this.Values) %>
</script>
                        var availableTags =  ['<%=String.join("','",test)%>'];
                        It would be something like this...
var availableTags =  ["<%= string.Join("\", \"", test) %>"];
or
var availableTags =  ['<%= string.Join("', '", test) %>'];
The first one would render as
var availableTags = ["Sweet", "Awesome", "Cool"];
and the second one would render as
var availableTags = ['Sweet', 'Awesome', 'Cool']; 
both of which are fine for autocomplete.
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