c# - ListItem Background is not working on Chrome -

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i want make image drop down in asp.net worked correctly in firefox , not working in ie , chrome. what's wrong code? searched in internet , tried many codes still it's not working. 

<body>    <form id="form1" runat="server">       <div>          <asp:dropdownlist id="drop" runat="server" width="100px"/>       </div>    </form> </body>

and in .cs file

protected void page_load(object sender, eventargs e) {     loading(); }  string imageurl;  private void loading() {     list<string> img = new list<string>()     {         "canada",         "usa",         "england",         "spain",         "india"     };     drop.datasource = img;     drop.databind();     (int = 0; < drop.items.count; i++)     {         switch (drop.items[i].text)         {             case "india":                 imageurl = "images/india.png";                 break;             case "usa":                 imageurl = "images/usa.png";                 break;             case "england":                 imageurl = "/images/england.png";                 break;             case "canada":                 imageurl = "/images/canada.png";                 break;             case "spain":                 imageurl = "/images/spain.png";                 break;         }         drop.enableviewstate = true;         drop.appenddatabounditems = true;         listitem item = drop.items[i];         item.attributes["style"] = "background: url(" + imageurl + ") no-repeat";     } }


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