Hi @usFarswan, this is exactly what I came up with just half an hour ago, and the solution is http://forums.asp.net/t/1751116.aspx?How+to+increase+maxJsonLength+for+JSON+POST+in+MVC3
And you can implement it like this, in global.asax , add the following lines that /// ***** points to.
namespace MyWebApp { // Note: For instructions on enabling IIS6 or IIS7 classic mode, // visit http://go.microsoft.com/?LinkId=9394801 public class MvcApplication : System.Web.HttpApplication { protected void Application_Start() { AreaRegistration.RegisterAllAreas(); WebApiConfig.Register(GlobalConfiguration.Configuration); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); XmlConfigurator.Configure(); DbHelper.getSessionFactory(); ///// ********** JsonValueProviderFactory jsonValueProviderFactory = null; foreach (var factory in ValueProviderFactories.Factories) { if (factory is JsonValueProviderFactory) { jsonValueProviderFactory = factory as JsonValueProviderFactory; } } //remove the default JsonVAlueProviderFactory if (jsonValueProviderFactory != null) ValueProviderFactories.Factories.Remove(jsonValueProviderFactory); //add the custom one ValueProviderFactories.Factories.Add(new CustomJsonValueProviderFactory());** /////************* } } ///******** public sealed class CustomJsonValueProviderFactory : ValueProviderFactory { private static void AddToBackingStore(Dictionary<string, object> backingStore, string prefix, object value) { IDictionary<string, object> d = value as IDictionary<string, object>; if (d != null) { foreach (KeyValuePair<string, object> entry in d) { AddToBackingStore(backingStore, MakePropertyKey(prefix, entry.Key), entry.Value); } return; } IList l = value as IList; if (l != null) { for (int i = 0; i < l.Count; i++) { AddToBackingStore(backingStore, MakeArrayKey(prefix, i), l[i]); } return; } // primitive backingStore[prefix] = value; } private static object GetDeserializedObject(ControllerContext controllerContext) { if (!controllerContext.HttpContext.Request.ContentType.StartsWith("application/json", StringComparison.OrdinalIgnoreCase)) { // not JSON request return null; } StreamReader reader = new StreamReader(controllerContext.HttpContext.Request.InputStream); string bodyText = reader.ReadToEnd(); if (String.IsNullOrEmpty(bodyText)) { // no JSON data return null; } JavaScriptSerializer serializer = new JavaScriptSerializer(); serializer.MaxJsonLength = int.MaxValue; //increase MaxJsonLength. This could be read in from the web.config if you prefer object jsonData = serializer.DeserializeObject(bodyText); return jsonData; } public override IValueProvider GetValueProvider(ControllerContext controllerContext) { if (controllerContext == null) { throw new ArgumentNullException("controllerContext"); } object jsonData = GetDeserializedObject(controllerContext); if (jsonData == null) { return null; } Dictionary<string, object> backingStore = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase); AddToBackingStore(backingStore, String.Empty, jsonData); return new DictionaryValueProvider<object>(backingStore, CultureInfo.CurrentCulture); } private static string MakeArrayKey(string prefix, int index) { return prefix + "[" + index.ToString(CultureInfo.InvariantCulture) + "]"; } private static string MakePropertyKey(string prefix, string propertyName) { return (String.IsNullOrEmpty(prefix)) ? propertyName : prefix + "." + propertyName; } } ///************* }