Calling a C# webmethod from Ajax

Question

I'm trying to call a server side function from ajax but keep getting this error

Invalid web service call, missing value for parameter: \u0027name\u0027.

here is the js code

var obj = { name: name, company: company, country: country, email: email, msg: Msg }
var json = JSON.stringify(obj);
$.ajax({
    method: "GET",
    url: "ContactUs.aspx/SendEmail",
    contentType: "application/json; charset=UTF-8",
    data: json,
    dataType:"json",
    success: function (data) {
        var a = 3;
    },
    error:function(a,b){
        var a = 43;
    }
})

and here is the c# webmethod

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public static string SendEmail(string name, string company, string country, string email, string msg)
{
    return string.Empty;
}

the names are identical between the js and c# vars and all of my vars have values.

thanks in advance

[Check this answer](http://stackoverflow.com/questions/18078957/pass-a-user-defined-object-to-asp-net-webmethod-from-jquery-using-json/18079544#18079544). Pass the entire object. — Equalsk, Mar 16 '17 at 17:19
I think a webmethod must be POST. here is a quick example of one https://www.aspsnippets.com/Articles/Calling-ASPNet-WebMethod-using-jQuery-AJAX.aspx — Bryan Dellinger, Mar 16 '17 at 17:30
orignially o used post but it kept giving me this error: An attempt was made to call the method \u0027SendEmail\u0027 using a GET request, which is not allowed. so i switched to get — Yonathanb, Mar 16 '17 at 17:40

Akshey Bhat · Answer 1 · 2017-03-16T17:26:11.843

1

$.ajax({
    method: "GET",
    url: "ContactUs.aspx/SendEmail?name=" + name + "&company=" + company + "&country=" + "&email=" +email + "&msg=" + Msg,
    dataType: "application/json",
    success: function (data) {
        var a = 3;
    },
    error:function(a,b){
        var a = 43;
    }
}) ;

Since its a GET type of request you need to pass required values for webmethod parameter in query string. you cant use data parameter for this as GET type of request has no payload.

edited Mar 16 '17 at 17:26

answered Mar 16 '17 at 17:20

Akshey Bhat

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I think Akshey might be correct. I would recommend using POST instead of GET, if possible, to avoid this limitation. For one thing, some web servers will not handle very long URLs correctly, so if you have a large amount of data in the URL, it is possible that the web server might truncate it. – Joe Irby Mar 16 '17 at 21:14

Calling a C# webmethod from Ajax

1 Answers1