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    copied!<p>Is your <a href="http://weblogs.asp.net/craigshoemaker/archive/2008/09/29/using-jquery-to-call-asp-net-ajax-page-methods.aspx" rel="nofollow">CallPageMethod</a> defined anywhere?</p> <pre><code>function CallPageMethod(methodName, onSuccess, onFail) { var args = ''; var l = arguments.length; if (l &gt; 3) { for (var i = 3; i &lt; l - 1; i += 2) { if (args.length != 0) args += ','; args += '"' + arguments[i] + '":"' + arguments[i + 1] + '"'; } } var loc = window.location.href; loc = (loc.substr(loc.length - 1, 1) == "/") ? loc + "default.aspx" : loc; $.ajax({ type: "POST", url: loc + "/" + methodName, data: "{" + args + "}", contentType: "application/json; charset=utf-8", dataType: "json", success: onSuccess, fail: onFail }); } </code></pre> <p>To get the return value of your server-side method, you will need to use the <code>onSuccess</code> callback, not by checking the value of <code>result</code>:</p> <pre><code>function ValidateDelete() { CallPageMethod("IsLangExists", success, fail); } function success(response) { if (response.d) { return confirm('Do you want to continue ?'); } alert('You can not delete this record'); } function fail(response) { //alert("An error occurred."); } </code></pre> <hr> <p>Here's how it should all look together:</p> <pre><code>&lt;script type="text/javascript"&gt; function CallPageMethod(methodName, onSuccess, onFail) { var args = ''; var l = arguments.length; if (l &gt; 3) { for (var i = 3; i &lt; l - 1; i += 2) { if (args.length != 0) args += ','; args += '"' + arguments[i] + '":"' + arguments[i + 1] + '"'; } } var loc = window.location.href; loc = (loc.substr(loc.length - 1, 1) == "/") ? loc + "default.aspx" : loc; $.ajax({ type: "POST", url: loc + "/" + methodName, data: "{" + args + "}", contentType: "application/json; charset=utf-8", dataType: "json", success: onSuccess, fail: onFail }); } function ValidateDelete() { CallPageMethod("IsLangExists", success, fail); } function success(response) { if (response.d) { return confirm('Do you want to continue ?'); } alert('You can not delete this record'); } function fail(response) { //alert("An error occurred."); } &lt;/script&gt; &lt;asp:GridView ID="grdList" OnRowCommand="grdList_RowCommand"&gt; &lt;Columns&gt; &lt;asp:BoundField DataField="LangId" HeaderText="LangId" Visible="false" /&gt; &lt;asp:TemplateField HeaderText="Delete"&gt; &lt;ItemTemplate&gt; &lt;asp:ImageButton ID="imgBtnDelete" runat="server" CommandName="_Delete" CommandArgument='&lt;%#Eval("LangId")%&gt;' ImageUrl="~/Image/delete_icon.gif" OnClientClick="return ValidateDelete();" ToolTip="Delete" /&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre>
 

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