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For example:
You want to get a client name from the client list. "GetClientName" function exposed through web service name called "Service1.asmx" and the function takes "Client Code" as a passing variable.

Copy the WebService behavior (webservice.htc file) into the Web project folder.

You can download webservice.htc file at this link: http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/samples/internet/behaviors/library/webservice/default.asp

Copy this javscript code and name it webservice.js and copy into the Web project folder.

var iCallID1;

function onBlur()
{
Get_ClientName();
}

function onEnter()
{
var kCode=event.keyCode;
if(kCode==13)
{
Get_ClientName();
}
}

function onWSresult()
{
if (event.result.error)
{
var xfaultcode = event.result.errorDetail.code;
var xfaultstring = event.result.errorDetail.string;
var xfaultsoap = event.result.errorDetail.raw;

alert("Error: " + xfaultcode + "|" + xfaultstring + "|" + xfaultsoap + "|");
}
else
{

if (iCallID1==event.result.id) {
document.all("ClientName").innerHTML = event.result.value;
}
}
}

function Get_ClientName() {
if (document.all("ClientCode").value != "") {
service.useService("http://www.charora.com/WebServices/Service1.asmx?WSDL","MyWebService");
iCallID1 = service.MyWebService.callService("GetClientName", document.all("ClientCode").value);
}
else {
alert ("Please enter client code ... ");
}
}

Create test.htm and include webservice.js in the test.htm

add a DIV tag and with following attributes

id="service"
style="behavior:url(webservice.htc)"
onresult="onWSresult();"

add input tag and with following attributes

type="text"
name="ClientCode"
Text=""
onblur="onBlur();"
onkeypress="onEnter();"

add another input tag and with following attributes

type="text"
name="ClientName"
Text=""

Finally, browse the test.htm file and enter client code and hit enter.

You will get the client name.