Using JSON with VB.NET ASP.NET 2.0

The upshot is that you need to get the JSON string back to the browser. You can either place it in a javascript variable (be sure to clean up line enders and single quotes if you do this) or pass it back as the result of an ajax query.

We actually use the built-in Javascript serializer since it has support both on the server and the client side and is quite easy to use. Assuming that you have an existing object, this code goes on the server side:

''' <summary>
''' This method safely serializes an object for JSON by removing all of the special characters (i.e. CRLFs, quotes, etc)
''' </summary>
''' <param name="oObject"></param>
''' <param name="fForScript">Set this to true when the JSON will be embedded directly in web page (as opposed to being passed through an ajax call)</param>
''' <returns></returns>
''' <remarks></remarks>
Public Function SerializeObjectForJSON(ByVal oObject As Object, Optional ByVal fForScript As Boolean = False) As String

If oObject IsNot Nothing Then
    Dim sValue As String

    sValue = (New System.Web.Script.Serialization.JavaScriptSerializer).Serialize(oObject)

    If fForScript Then
        ' If this serialized object is being placed directly on the page, then we need to ensure that its CRLFs are not interpreted literlally (i.e. as the actual JS values)
        ' If we don't do this, the script will not deserialize correctly if there are any embedded crlfs.
        sValue = sValue.Replace("\r\n", "\\r\\n")

        ' Fix quote marks
        Return CleanString(sValue)
    Else
        Return sValue
    End If
Else
    Return String.Empty
End If
End Function

On the client side, deserialization is trivial:

    // The result should be a json-serialized record
    oRecord = Sys.Serialization.JavaScriptSerializer.deserialize(result.value);

Once you have deserialized the object, you can use its properties directly in javascript:

alert('CPU = ' + oRecord.CPU);

In terms of generating the JSON try

    public class HardwareInfo
    {
        [JsonProperty(PropertyName = "CPU")]
        public string Cpu { get; set; }
        [JsonProperty(PropertyName = "PSU")]
        public string Psu { get; set; }
        [JsonProperty]
        public ICollection<string> Drives { get; set; }
    }

    public string SerializeHardwareInfo()
    {
        var info = new HardwareInfo
        {
            Cpu = "Intel",
            Psu = "500W",
            Drives = new List<string> { "DVD read/writer", "500 gigabyte hard drive", "200 gigabype hard drive" }
        };

        var json = JsonConvert.SerializeObject(info, Formatting.Indented);
        //  {
        //    "CPU": "Intel",
        //    "PSU": "500W",
        //    "Drives": [
        //      "DVD read/writer",
        //      "500 gigabyte hard drive",
        //      "200 gigabype hard drive"
        //    ]
        //  }
        return json;
    }

The formatting argument is optional. Best of luck.