Sandbox WebPart Postback too Large?

Question

Hi guys, I've done some research and it looks like the error I'm running into (when saving the web part properties) is that my post back is too large. 
This is a simple sandbox web part I'm building, which works great until I added the last configuration option which put me over the limit.
Web Part Code (.cs)
using System;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
namespace P.SPS.UI.Web_Parts.jQuery_UI_Accordion_Zone
[ToolboxItemAttribute(false)]
public class jQuery_UI_Accordion_Zone : WebPart
#region custom web part properties
[WebBrowsable(true),
Category("JQuery Options"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Include jQuery"),
WebDescription("Check to include reference to jQuery. * Google CDN")]
public bool includejQuery { get; set; }
[WebBrowsable(true),
Category("JQuery Options"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Include jQuery UI"),
WebDescription("Check to include reference to jQuery UI. * Google CDN")]
public bool includejQueryUI { get; set; }
[WebBrowsable(true),
Category("JQuery Options"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Include jQuery UI CSS"),
WebDescription("Check to include reference to jQuery UI CSS. * Google CDN")]
public bool includejQueryUICSS { get; set; }
[WebBrowsable(true),
Category("JQuery Options"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Include SPAccordions Script"),
WebDescription("Check to include the custom spaccordions() jQuery function.")]
public bool includeSPAccordionsScript { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Width (px)"),
WebDescription("If set a min and max width will be applied to the tab container. (integer)"),
DefaultValue(0)]
public int dataWidth { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Active"),
WebDescription("Which panel should be open? (integer)"),
DefaultValue(0)]
public int dataActive { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Scroll to Top on Activate"),
WebDescription("When set to true, the accordion will stay in view while switching headers.")]
public bool dataScrollToTop { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Collapsible"),
WebDescription("When set to true, the active panel can be closed.")]
public bool dataCollapsible { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Disabled"),
WebDescription("If set the accordion will be disabled.")]
public bool dataDisabled { get; set; }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Event"),
WebDescription("The type of event that the headers should react to activate the panel. (event in quotations and comma seperated)")]
public string dataEvent { get; set; }
public enum dataHeightStyleOptions { auto, fill, content }
[WebBrowsable(true),
Category("JQuery Accordion() Properties"),
Personalizable(PersonalizationScope.Shared),
WebDisplayName("Height Style"),
WebDescription("Controls the heigh of the accordion widget and each panel.")]
public dataHeightStyleOptions dataHeightStyle { get; set; }
#endregion
protected override void Render(HtmlTextWriter writer)
if (includejQuery)
writer.WriteLine("<script src=\"//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js\"></script>");
if (includejQueryUI)
writer.WriteLine("<script src=\"//ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/jquery-ui.min.js\"></script>");
if (includejQueryUICSS)
writer.WriteLine("<script language=\"javascript\">$('head').append('<link rel=\"stylesheet\" href=\"//ajax.googleapis.com/ajax/libs/jqueryui/1.10.4/themes/smoothness/jquery-ui.css\" />');</script>");
if (includeSPAccordionsScript)
writer.WriteLine("<script language=\"javascript\">$(document).ready(function(){if((document.getElementById(\"MSOLayout_InDesignMode\").value==1)?false:true){$(\".spaccordions\").spaccordions()}});(function(a){a.fn.spaccordions=function(){var e=a(this).data(),b={active:(e.active)?e.active:0,collapsible:(e.collapsible==1)?true:false,disabled:(e.disabled)?e.disabled:false,heightStyle:(e.heightstyle)?e.heightstyle:\"auto\",event:(e.event)?e.event:\"click\"};if(e.scrolltotop){b.activate=function(g,l){var k;if(l.newHeader.length==1){k=a(l.newHeader[0])}else{k=a(this).find(\".ui-accordion-header\").eq(0)}var i=a(window).height();var o=(a(window).scrollTop()==0)?a(\"#s4-workspace\").scrollTop():a(window).scrollTop();var h=k.height();var j=k.offset().top;var m=a(\"#s4-ribbonrow\").height();var n=j+o-m;console.log(\"elementScrollY \"+j);console.log(\"screenY \"+i);if(j>=m&&j<=i){}else{a(window).scrollTop(n);a(\"#s4-workspace\").scrollTop(n)}}}var f=a(this).parents(\"table\").eq(1);var d=a('<div class=\"accordion\">');if(e.width>0){d.width(e.width)}var c=a(\"\");a(this).parents(\"tr\").eq(1).remove();f.find(\".s4-wpTopTable\").each(function(h){var g=a(this).find(\" > tbody > tr > td\");c=c.add(\"<h3>\"+a(g[0]).find(\".ms-WPTitle\").text().trim()+\"</h3>\");c=c.add(\"<div>\"+a(g[1]).html()+\"</div>\")});d.append(c);f.before(d);f.hide();d.accordion(b);return this}})(jQuery);</script>");
writer.WriteBeginTag("div");
writer.WriteAttribute("class", "spaccordions");
// build custom jquery Accordion() options
if (!isEmptyorNull(Convert.ToString(dataWidth.ToString())))
writer.WriteAttribute("data-width", dataWidth.ToString());
if (!isEmptyorNull(Convert.ToString(dataActive)))
writer.WriteAttribute("data-active", dataActive.ToString());
if (!isEmptyorNull(Convert.ToString(dataCollapsible)))
writer.WriteAttribute("data-collapsible", Convert.ToString(dataCollapsible).ToLower());
if (!isEmptyorNull(dataDisabled.ToString()))
writer.WriteAttribute("data-disabled", dataDisabled.ToString());
if (!isEmptyorNull(dataEvent))
writer.WriteAttribute("data-event", dataEvent);
if (!isEmptyorNull(Convert.ToString(dataHeightStyle)))
writer.WriteAttribute("data-heightstyle", dataHeightStyle.ToString());
if (!isEmptyorNull(Convert.ToString(dataScrollToTop)))
writer.WriteAttribute("data-scrolltotop", Convert.ToString(dataScrollToTop).ToLower());
writer.Write(HtmlTextWriter.TagRightChar);
writer.WriteEndTag("div");
writer.WriteLine("<p>Use the web part properties menu to configure options for <a href=\"http://jqueryui.com/accordion/\" target=\"_blank\">jQuery UI Accordion</a>.</p>");
base.Render(writer);
protected void Page_Load(object sender, EventArgs e)
public bool isEmptyorNull(string value)
if (string.IsNullOrEmpty(value) || value == "0")
return true;
return false;
Now can anyone recommend how I could solve this issue? I'm not a back-end programmer :/.
Error after Post:
Web Part Error: Unhandled exception was thrown by the sandboxed code wrapper's Execute method in the partial trust app domain: An unexpected error has occurred.
Show Error Details
Debugger doesn't show anything so I know it wasn't reaching my code.

Answer 1

Hi,
What the last configuration option did you add?
Try to disable the ViewState of the .Net control in the web part.
Or
Add following into web.config(C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\ 14\UserCode) to avoid sandbox webpart error after post back.
<httpRuntime requestLengthDiskThreshold=”4096” /> (or set value as per your requirement)
Here is a blog for you to take a look at:
http://sohilmakwana.wordpress.com/2013/11/29/sandbox-error-unhandled-exception-was-thrown-by-the-sandboxed-code-wrappers-execute-method-in-the-partial-trust-app-domain/
If you want to achieve an Accordion web part, the following links for your reference:
http://altfo.wordpress.com/2013/06/18/jquery-accordion-based-announcement-web-part/
http://fitandfinish.ironworks.com/2010/02/how-to-create-an-accordion-web-part.html
Thanks,
Dennis Guo
TechNet Community Support
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Dennis Guo
TechNet Community Support