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    copied!<p>First you need to define the WCF like below</p> <pre><code> [OperationContract] [WebInvoke(UriTemplate = "/GetAreaNames", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)] List&lt;Area&gt; GetAreaNames(); </code></pre> <p>or for Multiple Parameters</p> <pre><code>[OperationContract] [WebInvoke(UriTemplate = "/ExcelDataInfo?area={area}&amp;month={month}", RequestFormat =WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped)] void ExcelDataInfo(string area, string month); </code></pre> <p>and after in the Script Page </p> <pre><code>var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function () { if (xmlhttp.readyState == 4 &amp;&amp; xmlhttp.status == 200) { var Items = JSON.parse(xmlhttp.responseText); var data = Items; var options; var length = Items.GetAreaNamesResult.length; for (var i = 0; i &lt; length; i++) { $("#CbxArea").append("&lt;option&gt;" + Items.GetAreaNamesResult[i].AreaName + "&lt;/option&gt;");//GetAreaNamesReult is your method and AreaName is variable } document.getElementById('CbxArea').selectedIndex = 1; } else { document.getElementById('CbxArea').innerHTML = '&lt;option&gt;Select Area&lt;/option&gt;'; } } xmlhttp.open("POST", "WCFService_url", true); xmlhttp.send(); </code></pre> <p>for passing multiple parameters like below</p> <pre><code> var url = "http://localohost:8090/ExcelDataInfo?area=" + area + "&amp;month=" + month; </code></pre>
 

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