MVVM Basics

Pretty Good one if you are looking for a webcast explaining MVVM pattern .

http://channel9.msdn.com/Events/TechEd/NorthAmerica/2010/DEV322

Access Denied while writing to EventLog

This happens due to permission issues. Check the below article.
http://support.microsoft.com/default.aspx?scid=kb;en-us;329291

!!!!!

SOAP Request Testing Tool

I am been using the SoapUI tool for quite some time and it's pretty impressive.

You can get it from :
http://www.soapui.org/

In order to work with Soap Request which needs authentication , there is a tab "AUT" wherein your can specify credential.
http://www.soapui.org/SOAP-and-WSDL/authenticating-soap-requests.html

Resource not found 404 error ( WCF Data service hosted with MVC ASP.NET)

Scenario: MVC ASP.NET application containing WCF data services. When you try to browse WCF data service .svc page you might get the error
"Resource not found -404 error" .

Reson for such behavior : When you try to browse to data service page , the request is sent to MVC framework first rather than data service . As the controller is not defined for such request , error is send back.

Resolution :Ignore request redirection to MVC framework when WCF data service is requested .In order to achieve this add following to global.asax RegisterRoute function.

routes.IgnoreRoute("{resource}.svc/{*pathInfo}");

System.Data.Entity.DbUpdateException

{System.Data.Entity.DbUpdateException: An error occurred while saving entities that do not expose foreign key properties for their relationships. The EntityEntries property will return null because a single entity cannot be identified as the source of the exception. Handling of exceptions while saving can be made easier by exposing foreign key properties in your entity types. See the InnerException for details. ---> System.Data.UpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.ArgumentException: Parameter value '12.50000' is out of range.
at System.Data.SqlClient.TdsParser.TdsExecuteRPC(_SqlRPC[] rpcArray, Int32 timeout, Boolean inSchema, SqlNotificationRequest notificationRequest, TdsParserStateObject stateObj, Boolean isCommandProc)
at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
--- End of inner exception stack trace ---
at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
at System.Data.Entity.Internal.InternalContext.SaveChanges()
--- End of inner exception stack trace ---





Got above error while performing database.save() of Entity Model .

The reason for failure was the decimal field in DB which was set for DECIMAL(6,5) whereas the value trying to be saved was 12.00000 .

This is how it works :

e.g.
decimal of (4,1) can hold upto 999.9
decimal of (3,1) can hold upto 99.9

Executing Java .jar within .NET

using System.Diagnostics;



Process process = new Process();

//Path wherein Java is installed in your machine
process.StartInfo.FileName = "java.exe";
//.jar file to be executed
process.StartInfo.Arguments = @"-jar Sample.jar";

process.StartInfo.UseShellExecute = false;

process.StartInfo.RedirectStandardOutput = true;

process.StartInfo.RedirectStandardError = true;

process.Start();

//Get the output from stream
Console.WriteLine(process.StandardOutput.ReadToEnd());

//in case of no error ExitCode will be zero
if(process.ExitCode)
{
//In case of error , get error description
string error = process.StandardError.ReadToEnd();
}

Console.WriteLine(error);

process.WaitForExit();

An entity object cannot be referenced by multiple instances of IEntityChangeTracker.

I got this error due to using separate context object for an entity. I had to use same context object to perform multiple operations in Entity .

Request Error

Getting generic request error while browsing ?Set the includeExceptionDetailInFaults = true in web.config in order to get some descriptive error message.

Specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider

I got this error when i was trying to browse the WCF data Services. The resolution for this issue was to define the connection string for database defined in in app.config file to the web.config file of the web application.

In Nutshell , below is my scnerio :

Project 1 : Contains the .edmx and app.config file

Project 2 : Contains the .SVC referencing entity model defined in project 1 and web.config file

Resolution :

Copy the Db connection defined in app.config to web.config under configuration section .

Format ComboBox ExtJS

items: [

{

xtype: 'combobox',

fieldLabel: 'State',

store: 'TestStore',

queryMode: 'local',

displayField: 'State',

listConfig: {

getInnerTpl: function () {

return '

{State}:{status}

';

}

}

}

Tab Inside a Tab ExtJS

Ext.create('Ext.TabPanel', {

renderTo: Ext.getBody(),

id: 'main-tabs',

height: 300,

width: 600,

activeTab: 0,

defaults: {

padding: 10

},

items: [{

xtype: 'tabpanel',

title: 'Tab 1',

id: 'tab1',

activeTab: 0,

padding: 5,

border: true,

plain: true,

defaults: {

padding: 10

},

items: [{

title: 'Sub-tab 1',

id: 'subtab1',

html: 'Sub-tab 1 content'

},{

title: 'Sub-tab 2',

id: 'subtab2',

html: 'Sub-tab 2 content'

},{

title: 'Sub-tab 3',

id: 'subtab3',

html: 'Sub-tab 3 content'

}]

},{

title: 'Tab 2',

id: 'tab2',

html: 'Tab 2 content'

},{

title: 'Tab 3',

id: 'tab3',

html: 'Tab 3 content'

},{

title: 'Tab 4',

id: 'tab4',

html: 'Tab 4 content'

},{

title: 'Tab 5',

id: 'tab5',

html: 'Tab 5 content'

}]

});

});

Adding panel to ViewPort (ExtJS)

Add Panels to ViewPort on the fly

1) Define ViewPort

viewport = Ext.create('Ext.container.Viewport', {

layout: {

type: 'border'

},

defaults: {

split: false

},

items: [{

region: 'center',

layout: 'border',

frame: false,

padding: '0 5 0 0',

border: false,

items: [{

region: 'center',

items: [

{

xtype: 'grid1'

}

]

}]

},

{

region: 'south',

frame: false,

padding: '0 5 0 0',

border: false

}

]

});

2) Add panel on the fly to defined region. In our example we are adding panel to "South" region

southRegion = viewport.getComponent(1);

southRegion .add(myPanel);

southRegion .setWidth(200);

southRegion .doLayout();

Remove Special character from String

string Formatted = Regex.Replace(, @"[\-]", "");

Regular Expression for YYYYMM

Well i managed to make this one for now. If you have better one please share .

YYYYMM

(^(19|20)\d{2})((0[1-9])|(1[0-2])$)

e.g.
PASS : 200901 , 201012 ...

FAILS :211001 , 200913 ...

Timeout Ext.Ajax.request

Set :

Ext.Ajax.timeout = < millisecond >;

e.g.

Ext.Ajax.timeout = 90000;

Get Security Information from Client

In order to get the security information from client in a Service , use the following Class :

ServiceSecurityContext Class

ServiceSecurityContext.Current.WindowsIdentity.Name
ServiceSecurityContext.Current.PrimaryIdentity.Name

More Information:
http://msdn.microsoft.com/en-us/library/system.servicemodel.servicesecuritycontext.aspx

Message: Expected identifier, string or number

If you get this error in your Ext JS page , then there is big possibility that you have added a extra comma which is not required .

E.g.

Incorrect entry

{

title: 'Main Content',

collapsible: false,

region: 'center',

layout: 'fit',

margins: '5 0 0 0',

xtype: 'panelbais' , }

Correct entry

{

title: 'Main Content',

collapsible: false,

region: 'center',

layout: 'fit',

margins: '5 0 0 0',

xtype: 'panelbais' }

Check out the last comma before the closing curly braces .

'undefined' is null or not an object in ext-all.js

One more ext-all.js error . This time it was due to extra comma in object literal definition.

Resolution :

Find and remove extra comma.

'flex' is null or not an object in ext-all.js

I got this error for quite some time and i had no clue what was wrong in my page . Page consisted of only 2 panel controls . That's all

After playing around with some of properties of panel , the issue was resolved.

Issue in my case :

First panel had property layout: 'anchor'

Second Panel had property layout: 'border '

Resolution :

Changed the second panel property layout: 'anchor'

This might not be your case . This error is very generic and can pop up due to multiple reasons .

Ext JS : Data Model proxy for Json and XML return type

JSON RETURN DATA

If you data is returned in JSON format then your proxy for Data Model will look like :

Ext.define("Post", {

extend: 'Ext.data.Model',

proxy:

{

type: 'rest',

url : 'http://xyz.com/ID/18/',

reader: {

type: 'json',

root: 'CUSTOMER'

}

}

XML Return Data

Ext.define("Post", {

extend: 'Ext.data.Model',

proxy: {

type: 'ajax',

url : 'http://xyz.com/ID/18',

reader: {

type: 'xml',

record: 'CUSTOMER'

}

},