For this purpose, ASP.NET Ajax framework has a Sys.Net.WebServiceProxy invoke method. More about this control can be found in the documentation. Here I will show one simple solution which use invoke method to call some dummy web service method. I wrote a simple Ajax Button extender which reads text of the specified TextBox control and pass this value to the web service method.

Type.registerNamespace('SampleButtonExtenderControl');

SampleButtonExtenderControl.SampleButtonExtenderControlBehavior =

    function(element) {

    SampleButtonExtenderControl.SampleButtonExtenderControlBehavior.

              initializeBase(this, [element]);

    this._servicePath = null;

    this._serviceMethod = null;

    this._textBoxId = null;

    this._textboxtext = null;

    this._mouseClickHandler = null;

}

SampleButtonExtenderControl.SampleButtonExtenderControlBehavior.prototype={

    initialize : function() {

       SampleButtonExtenderControl.SampleButtonExtenderControlBehavior.

                 callBaseMethod(this, 'initialize');

        var target = this.get_element();

        this._mouseClickHandler = Function.createDelegate(this,

                this._onMouseClick);

        $addHandlers(target, {'click':this._mouseClickHandler}, this);

    },
    dispose : function() {

        $clearHandlers(this.get_element());

        delete this._mouseClickHandler;

        SampleButtonExtenderControl.SampleButtonExtenderControlBehavior.

                callBaseMethod(this, 'dispose');

    },
    _onMouseClick : function(e) {

        var txtbx = $get(this._textBoxId);

        this._textboxtext = txtbx.value;

        //alert('Sending ' + this._textboxtext + ' to the web

        service method');

Sys.Net.WebServiceProxy.invoke(

this._servicePath,

this._serviceMethod,

false,

{textboxtext : this._textboxtext});

},

get_ServicePath : function() {

return this._servicePath;

},

set_ServicePath : function(value) {

this._servicePath = value;

},

get_ServiceMethod : function() {

return this._serviceMethod;

},

set_ServiceMethod : function(value) {

this._serviceMethod = value;

},

get_TextBoxId : function() {

return this._textBoxId;

},

set_TextBoxId : function(value) {

this._textBoxId = value;

}

}
SampleButtonExtenderControl.SampleButtonExtenderControlBehavior.

registerClass('SampleButtonExtenderControl.

SampleButtonExtenderControlBehavior',

AjaxControlToolkit.BehaviorBase);

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