How to call a C# function from JavaScript?

Question

I want to call CsharpFunction, a C# function in code-behind, from JavaScript. I tried the code below but whether the JavaScript condition is True or False, CsharpFunction was called regardless!

JavaScript code:

if (Javascriptcondition > 0) {    <%CsharpFunction();%> } 

C# code behind:

protected void CsharpFunction() {   // Notification.show(); } 

How do I call a C# function from JavaScript?

Answer 1

You can use a Web Method and Ajax:

<script type="text/javascript">             //Default.aspx    function DeleteKartItems() {               $.ajax({          type: "POST",          url: 'Default.aspx/DeleteItem',          data: "",          contentType: "application/json; charset=utf-8",          dataType: "json",          success: function (msg) {              $("#divResult").html("success");          },          error: function (e) {              $("#divResult").html("Something Wrong.");          }      });    } </script>  [WebMethod]                                 //Default.aspx.cs public static void DeleteItem() {     //Your Logic } 

Answer 2

.CS File         namespace Csharp     {       public void CsharpFunction()       {         //Code;       }     }      JS code:     function JSFunction() {             <%#ProjectName.Csharp.CsharpFunction()%> ;     } 

Note :in JS Function when call your CS page function.... first name of project then name of name space of CS page then function name