[Solved] How to get control values and modify them in Page Methods?

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Quick example: 

<asp:ScriptManager runat="server" EnablePageMethods="true" />
<!-- or ToolkitScriptManager, but remember to put only one -->

<script type="text/javascript">
    function invokeMethod() {
        x = document.getElementById('<%= TextBox1.ClientID %>').value;
        PageMethods.theMethod(x, OnSuccess, OnFailure);
    }
    function OnSuccess(r) {
        document.getElementById('<%= TextBox1.ClientID %>').value = r;
    }
    function OnFailure(r) {
        alert(r._message);
    }
</script>


    [System.Web.Services.WebMethod()]
    public static string theMethod(string x)
    {
        return x + "!!!";
    }

solved How to get control values and modify them in Page Methods?