Archive for the ‘.net’ Category

How to fix “Unit Test Runner failed to load test assembly”

April 4, 2012 Leave a comment

I encountered this issue a couple times during my recent project, every time I forgot what actually cause the issue. Therefore, I decide to write a quick blog post to make sure I can identify the issue quickly.

Run unit test using a test runner and received a Unit Test Runner failed to load test assembly exception.


Basically, I have changed some code and start the test runner to run tests. The same dll have already been deployed to GAC. So the test runner actually tries to use the old version of the assembly thus could not load the assembly.


Deploy the current version of dll to the GAC and re-run your test, it works like a charm.


Installing ScrewTurn Wiki using source code (SQL Server)

January 11, 2010 Leave a comment

In the past 2 weeks ,I have try to install ScrewTurn Wiki using source code. I follow the instruction from here .It does not work after the installation.After a bit debugging ,it turns out that the instructions is not complete.I got the following error:

Could not load file or assembly ‘SqlServerProviders’ or one of its dependencies. The system cannot find the file specified.

It missing one more step from the instructions ,if you read the comment in the ProviderLoader.cs it says // assemblyName should be an absolute path or a relative path in bin or public\Plugins.

The extra step is that create Plugins folder in the directory \WebApplication\public\ and copy the SqlServerProviders.dll from \SqlServerProviders\bin\Debug to the Plugins folder.Refresh your page ,it works like charm.

Categories: .net

ConfigurationManager v.s. WebConfigurationManager

August 9, 2009 Leave a comment

Web application should use WebConfigurationManager whereas winform application should use ConfigurationManager.

  1. The WebConfigurationManager class has a GetWebApplicationSection method that the ConfigurationManager class does not have
  2. The OpenMappedExeConfiguration method of the ConfigurationManager is replaced with the OpenMappedWebConfiguration method of the WebConfigurationManager
  3. The OpenExeConfiguration method of the ConfigurationManager is replaced with the OpenWebConfiguration method of the WebConfigurationManager

How to use it?
To be able to use WebConfigurationManager , you need to add System.Web reference and use it like this System.Web.Configuration.WebConfigurationManager or adding appropriate using statement.

To be able to use ConfigurationManager, you need to add System.Configuration reference and use it like this System.Configuration.ConfigurationManager or adding appropriate using statement.

Categories: .net,

Working with jqGrid and WCF service

July 20, 2009 2 comments

Today , I am going to show how to work with jqGrid with WCF in application. jqGrid is an Ajax-enabled JavaScript control that provides solutions for representing and manipulating tabular data on the web.You can download a copy of the code from here

1. To start with , we need to download the latest version of jQuery and jqGrid plug-in. At the time of writing ,the latest version of jqGrid is jqGrid 3.5 beta. The major differences for this version is that starting with this version, jqGrid does not use a loader (which loads the needed files one by one), but all the needed code is contained in one file. The desired modules can be built using the jqGrid download manager . In order to use this, first a language file should be loaded and then the jqGrid file.

2. Next, you need to add JavaScript into your project and references using script tag. In order to use jqGrid 3.5, first a UI theme CSS file should be loaded. The detailed instruction is in the downloaded jqGrid zip file.Then,we need to create an AJAX-Enabled WCF Service in our web project. We need to create an method in the WCF service and add the following attributes to the method.

[WebInvoke(Method = "POST",
BodyStyle = WebMessageBodyStyle.WrappedRequest,
ResponseFormat = WebMessageFormat.Json
public string GetProducts()
IList personList = ProductRepository.GetProducts();
int total = 1, page = 10;
ProductJqGridView productJqGridView = new ProductJqGridView(total, page, personList);
return productJqGridView.ToJson();

GetProducts method will return a list of products.After that I am instantiate ProductJqGridView object and call ToJson method to serialize the object into the correct JOSN format so that the jqGrid can consume it.

3. Before we looked the JavaScript ,we need to see what required in the markup. We need a table to display the data ,a div for the page navigation and button to load the data.Please see the source code for details.

4. Last, we are going to look at how to write JavaScript to bind the JSON data to the jqGrid.We use function as our datatype.The function we are using is getProducts which doing an AJAX call to the server and a JSON string is returned.In the successFunction we insert all the data into the jqGrid by calling thegrid.addJSONData.

function successFunction(jsondata) {
var thegrid = jQuery("#productGridView")[0];

function getProducts() {
url: “linkification-ext” href=”http://DataLoader.svc/GetProducts” title=”Linkification: http://DataLoader.svc/GetProducts“>DataLoader.svc/GetProducts“,
data: “{}”, // For empty input data use “{}”,
dataType: “json”,
type: “POST”,
contentType: “application/json; charset=utf-8”,
success: successFunction
function dataBindToGrid() {
datatype: getProducts,
colNames: [‘ProductID’, ‘Name’, ‘ProductNumber’, ‘Color’, ‘Size’, ‘Style’],
colModel: [{ name: ‘ProductID’, index: ‘ProductID’, width: 200, align: ‘left’ },
{ name: ‘Name’, index: ‘Name’, width: 200, align: ‘left’ },
{ name: ‘ProductNumber’, index: ‘ProductNumber’, width: 200, align: ‘left’ },
{ name: ‘Color’, index: ‘Color’, width: 200, align: ‘left’ },
{ name: ‘Size’, index: ‘Size’, width: 200, align: ‘left’ },
{ name: ‘Style’, index: ‘Style’, width: 200, align: ‘left’ }
rowNum: 10,
rowList: [5, 10, 20, 50, 100],
sortname: ‘ProductID’,
pager: jQuery(‘#pageNavigation’),
sortorder: “desc”,
viewrecords: true
jQuery(document).ready(function() {
jQuery(“input#LoadData”).live(“click”, dataBindToGrid);

A word of caution…

This is only a simple example using jqGrid, many of its functionalities have not been implemented. Since this is only a “Hello World” like example, I will show some of its advanced functionalities in some other article.
The hardest part for using AJAX and jqGrid is not the concept but the level of JavaScript skills. To be able to write maintainable AJAX code, you need to learn JavaScript. I have created an article on my blog to help you learn JavaScript. Here is the link. I hope my examples can help people get started using jqGrid using WCF in an ASP.NET web application. Your feedback is much more appreciated.

kick it on

Categories: .net, AJAX, javascript, jQuery, WCF