Writing Code is fun, see here :)


Some really nice comments I have picked during a peer review.

// Server Side Validation Functions 
private bool ValidateGeneralDOB(object fieldValue) 
  DateTime dt;

    return false; // are you kidding me, you should be born :( 

  else if (!DateTime.TryParse(fieldValue.ToString(),out dt)) 
    return false; // you should be born on a valid date 

  else if(dt>DateTime.Now.AddYears(-20)) // to little :) 
   return false; 

  else if (dt < DateTime.Now.AddYears(-90)) // to old :| 
   return false;

 // your are the one we are looking for 
  return true; 




About CAE Solutions

Web: http://www.caesolutions.com/

Linkedin: https://www.linkedin.com/company/301183/

Sally Verrilli post on how CAE Solutions helped UnitedHealth Group with a system that is dying or dead: https://lnkd.in/eecCsuu

An extract from her post:

Who’s been here?

You work in a big company.

You lead a department that has a system that is dying or dead.
You don’t need the space shuttle.
You need something to keep you in orbit for a year or two.
Your system need isn’t big enough to merit capital.

This was my situation last year.  I had to have a system that worked within 1 year or I was screwed. My internal team was in transition and I didn’t know if they would be stable enough or able enough to get this done after I announced the death of the legacy system. (Back then, we were new to each other.  Now I know they CAN.)

My budget wasn’t big but I knew I had to do something.
I needed to up my odds of success.

The vendor that helped build my new, interim system is CAE Solutions. It wasn’t easy;  but it got done and done on time and on budget.  The new system has been up and running with great success for 11 months now, and we are headed into our second busy season with it.

I have no vested interest in CAE, and this is not a sales pitch.  I took a chance and it worked out.  System builds rarely have happy endings for many reasons.  This one did.  Call Anil Gupta at CAE solutions if you need help. It worked for me.

Design Patterns: a possible way to memorize all

When we starts for new coding/development/architecture design task, it comes handy if one have patterns on your finger tips, following is a possible way to starts with 🙂

Creational Patterns: Abram became first president of states

  1. Abram: Abstract
  2. became: builder
  3. first: factory
  4. president: prototype
  5. states: Singletion

Structural Patterns: ABCD Faces a Flying Proxy .

  1. A: Adaptor
  2. B: Bridge
  3. C: Composite
  4. D: Decorator
  5. Faces: Facade
  6. Flying: Flyweight
  7. Proxy : Proxy

Behavioral Patterns: MMIICC ON TVS

  1. M: Mediator
  2. M: Memento
  3. I: Iterator
  4. I: interpreter
  5. C: Chain of responsibly
  6. C: Command
  7. O: Observer
  8. N: Null Object
  9. T: Template
  10. V: Visitor
  11. S: States, Strategy

How to use ?? Operator in C# to assign a nullable type to a non nullable type?

Code example

int? nullableInt = null;
 int nonNullableInt = nullInt ?? 0;
 //sets the nullableInt's value to the nonNullableInt 
 // only when it has a value, else it will set 0.
 //in our case it will assign 0
 //prints 0

This ?? operator can be used to save code that will test for null and then we will set the value.

What is ASP.NET Core 1.0 and .NET Core 1.0 and what is future of ASP.NET 5 and 4.6!

ASP.NET 5 is now ASP.NET Core 1.0.

.NET Core 5 is now .NET Core 1.0.

The name is has changed, nothing more than this!

Why new name 1.0?

Because the concept is new, its not having same architecture as previous version of ASP.net till 4.6.

However till now, the .NET Core 1.0 is not mature as earlier .NET Frameworks were, this is in testing and development phase. Earlier ASP.NET version are more mature and very well tested for developing a new project.

ASP.NET Core 1.0 is a 1.0 release which has Web API and MVC but not SignalR and Web Pages. It does not have VB and F# till now, they will be added in near future.

ASP.NET Core 1.0 a new framework, but earlier ASP.NET 4.6 version will remain there, and will be fully supported, but ASP.NET Core 1.0 is new, very new…

SQL SERVER – Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding

Some errors when encountered take most of us for a spin. In this category the error related to “Timeout” surely falls. If you are a web developer and receive the same there are a hundred combinations why this can possibly happen. The web results can sometimes lead us in completely opposite direction because we have…

Source: SQL SERVER – Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding

Calling an oData Batch using .net HttpClient class

You have full code here, no theory!

Private Async Function SaveEntityAsBatch() As Threading.Tasks.Task
Using Client As New HttpClient()
Dim APIhostUri As String = “http://localhost:2025/&#8221;
Dim APIResponse As HttpResponseMessage
Client.BaseAddress = New Uri(APIhostUri)
Dim content As HttpContent

‘Required if you need dates serialization

Dim microsoftDateFormatSettings As JsonSerializerSettings = New JsonSerializerSettings With {
.DateFormatHandling = DateFormatHandling.IsoDateFormat,
.DateParseHandling = DateParseHandling.DateTimeOffset, .DateTimeZoneHandling = DateTimeZoneHandling.Utc

‘ Batch Process
Dim boundary As String = “–changeset_Data—”
Dim batchContent As New MultipartContent(“mixed”, “–batch” & boundary)

Dim RqP As New HttpRequestMessage(HttpMethod.Put, “URL(id)/”)
RqP.Content = New StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(projectRequest, microsoftDateFormatSettings))
If RqP.Content.Headers.Contains(“Content-Type”) Then RqP.Content.Headers.Remove(“Content-Type”)
RqP.Content.Headers.Add(“Content-Type”, “application/json”)
Dim ReqContent As New HttpMessageContent(RqP)
If ReqContent.Headers.Contains(“Content-Type”) Then ProjectContent.Headers.Remove(“Content-Type”)
ReqContent.Headers.Add(“Content-Type”, “application/http”)
ReqContent.Headers.Add(“Content-Transfer-Encoding”, “binary”)
ReqContent.Headers.Add(“client-request-id”, “12345678”)
ReqContent.Headers.Add(“return-client-request-id”, “True”)
ReqContent.Headers.Add(“Content-ID”, “1”)
ReqContent.Headers.Add(“DataServiceVersion”, “3.0”)
If ReqContent.Headers.Contains(“contentTypeMime-Part”) Then ReqContent.Headers.Remove(“contentTypeMime-Part”)
ReqContent.Headers.Add(“contentTypeMime-Part”, “Content-Type:application/http;”)



Dim RqR As New HttpRequestMessage(HttpMethod.Put, “URL2/”, PtsAPIhostUri)
RqR.Content = New StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(report, microsoftDateFormatSettings))
If RqR.Content.Headers.Contains(“Content-Type”) Then RqR.Content.Headers.Remove(“Content-Type”)
RqR.Content.Headers.Add(“Content-Type”, “application/json”)
Dim ReqContent2 As New HttpMessageContent(RqR)

If ReqContent2.Headers.Contains(“Content-Type”) Then ReportContent.Headers.Remove(“Content-Type”)
ReqContent2.Headers.Add(“Content-Type”, “application/http”)
ReqContent2.Headers.Add(“Content-Transfer-Encoding”, “binary”)
ReqContent2.Headers.Add(“client-request-id”, “99999”)
ReqContent2.Headers.Add(“return-client-request-id”, “True”)
ReqContent2.Headers.Add(“Content-ID”, “2”)
ReqContent2.Headers.Add(“DataServiceVersion”, “3.0”)

If ReqContent2.Headers.Contains(“contentTypeMime-Part”) Then ReqContent2.Headers.Remove(“contentTypeMime-Part”)
ReqContent2.Headers.Add(“contentTypeMime-Part”, “Content-Type:application/http;”)
Dim batchRequest As HttpRequestMessage = New HttpRequestMessage(HttpMethod.Post, APIhostUri & “/$batch/”)
batchRequest.Content = batchContent
Dim APIResponseBatch = Await Client.SendAsync(batchRequest)
Dim streamProvider = APIResponseBatch.Content.ReadAsMultipartAsync().Result()

For Each cnt As HttpContent In streamProvider.Contents

End Using
End Function

I got following errors in given sequences and I continued to add the header and finally I was able to two PUT request in Batch.

Error #1

The ‘Content-Type’ header value ‘application/http; msgtype=request’ is invalid. When this is the start of the change set, the value must be ‘multipart/mixed’; otherwise it must be ‘application/http’.

Error #2

The content type ‘multipart/mixed’ specifies a batch payload; however, the payload either does not include a batch boundary or includes more than one boundary. In OData, batch payload content types must specify exactly one batch boundary in the ‘boundary’ parameter of the content type.

Error #3

Nested change sets in a batch payload are not supported.

Error #3 took most of the time to find out this URL https://msdn.microsoft.com/en-us/library/azure/dn878159.aspx from MSDN, which speaks about adding following Header Content Types

ReqContent2.Headers.Add(“client-request-id”, “99999”)
ReqContent2.Headers.Add(“return-client-request-id”, “True”)
ReqContent2.Headers.Add(“Content-ID”, “2”)
ReqContent2.Headers.Add(“DataServiceVersion”, “3.0”)

After adding above four types to header Error #3 was gone and my Batch was working.

The URL from MSDN says;

Add Tasks requests in Batch service support the following concepts:

  • Each request must contain a unique Content-ID MIME part header. This header is returned with the result of the operation in the response, and can be used to match an individual request with its response.
  • The Batch service returns a HTTP Status Code 400 (Bad Request) if any request contains an invalid set of headers or contains operations which are not supported in the batch.
  • The Batch service returns a HTTP Status Code 202 (Accepted) for a valid Add Tasks request. The server will then stream the results of individual operations.
  • The Batch service can re-order the responses of these Add Task requests. The Content-Id MIME part header needs to be used by the Client to match the request corresponding to the response. The response contains the results and error information for each operation.If the server times out or the connection is closed during an Add Tasks request, the request may have been partially or fully processed, or not at all. In such cases, the user should re-issue the request. Note that it is up to the users to correctly deal with failures when re-issuing a request. For example, the users should use the same task names during retry, so that if the prior operation succeeded, the retry will not create extra tasks unexpectedly.
  • An Add Tasks request can include at most 100 operations.
  • All the tasks in an Add Tasks request must belong to the same workitem and job.