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Calling server side (cs file) method from client side through Page Method in asp.net C# (CSharp)



// .Aspx Coding //

<script type="text/javascript">

function CallMe(src,dest) {
var ctrl = document.getElementById(src);
// call server side method
PageMethods.GetContactName(ctrl.value,CallSuccess,CallFailed, dest);
}

// set the destination textbox value with the ContactName
function CallSuccess(res, destCtrl) {
var dest = document.getElementById(destCtrl);
dest.value = res;
}

// alert message on some failure
function CallFailed(res, destCtrl) {
alert(res.get_message());
}

</script>
// Add Ajax Script Manager in form
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />

// .CS Coding //

[System.Web.Services.WebMethod]
public static string GetContactName(string custid)
{
if (custid == null || custid.Length == 0)
Return String.Empty;

// Make Database connection and return a specific value
Return custid;

}
// Write On Page Load Event
If (!Page.IsPostBack)
{
txtId1.Attributes.Add("onblur", "javascript:CallMe('" + txtId1.ClientID + "', '" + txtContact1.ClientID + "')");
txtId2.Attributes.Add("onblur", "javascript:CallMe('" + txtId2.ClientID + "', '" + txtContact2.ClientID + "')");
}

// .Aspx Coding //
 <script language="javascript" type="text/javascript">
function CalcSum() {
var firstNo = document.getElementById("<%= txtFirstNo.ClientID %>").value;
var secondNo = document.getElementById("<%= txtSecNo.ClientID %>").value;
if (firstNo != '' && secondNo != '') {
PageMethods.getSum(firstNo, secondNo, FillSumBox);
}
}

// Call on Succeed
// set the return value from server side to destination textbox value
function FillSumBox(val) {
document.getElementById("<%= txtSum.ClientID %>").value = val;
}
</script>
// Add Ajax Script Manager in form
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true" />
<input id="btnSum" type="button" onclick="CalcSum()" value="Calculate Sum" />


// .CS Coding //
[System.Web.Services.WebMethod]
public static int getSum(int num1, int num2)
{
return (num1 + num2);
}

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