jquery - How to force datatype as JSON in ASP.Net 2.0

Question

I got the following working after spinning my head around a thousand times and then referring parserrror SyntaxError: Unexpected token < - Load Partial View using jQuery Ajax in ASP.NET MVC 4

I have the following code in my ASP.Net 2.0 project. It works – but to get it to work, I am using dataType: "html". When I use JSON as datatype I get a parse error: Unexpected token <

How can we make it work with JSON?

Note: Though I am using IE8, some of my users are still using IE6. So I need a solution that works in IE6.

jQuery Ajax

   $.ajax({
            type: "GET",
            url: "admPlantParametersViewEdit.aspx/GetResult",
            contentType: "application/json; charset=utf-8",
            dataType: "html",
            success: function(msg) 
            {
                alert("Hi");
            },
            error: errorFunction
        });

VB.Net

   <WebMethod()> _
    Public Shared Function GetResult() As String

        Return "hello"

    End Function

Request and Response Headers

References

1. Differences between contentType and dataType in jQuery ajax function
2. What is content-type and datatype in an AJAX request?
3. How to return JSON from a 2.0 asmx web service
4. ASP.NET AJAX PageMethods call load whole page for .NET 4.5 IIS 7.5
5. Support cross-domain requests (specifically multiple methods in WebInvoke) in Rest WCF
6. jQuery $.ajax(), $.post sending "OPTIONS" as REQUEST_METHOD in Firefox
7. Cannot set content-type to 'application/json' in jQuery.ajax

Answer 1

in request you need to set Accept: application/json ,the if you server has json support then it will send response in json automatically,

        type: "GET",
        url: "admPlantParametersViewEdit.aspx/GetResult",
        contentType: "application/json; charset=utf-8",
        Accept: application/json,

then in response header you should see

        content-type:application/json 

not content-type:text/html