We Keep Coding

How do I figure out the exact cause of error in EF update?

I have read the other threads on this, and none of them have answers that resolve my current scenario, nor are they similar. My scenario is reproducible on each run of my application, though I can't seem to produce a smaller piece of code that creates this error.
I'm getting the following error:
An exception has been raised that is likely due to a transient failure. If you are connecting to a SQL Azure database consider using SqlAzureExecutionStrategy.
The inner exception says:
A transport-level error has occurred when receiving results from the server. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired.)
I am not connecting to a SQL Azure database. The connection is to a remote database through VPN, hosted on premises. To give some more context, I'm importing data from an external system, and every time it gets up to a specific record, it always fails when I try to update the entity after creating it. I've tried setting debug logging on in EF and copying the statement it generates into SSMS and running it with the same credentials with no errors. The only differentiating factor between this record and the previous records are the audit fields (time created/modified) and the name, which has changed from 1USD - Holding 99 to 1USD - Holding 100. I actually tested out changing the order which the records get imported, and it always fails at 100 when editing in EF after creation, so there's probably some other underlying issue at hand here. The field itself in the database is handling strings with a higher length than this, including this same process with no errors.
This obviously doesn't seem to actually be a transient failure, nor does it seem to be a connection issue, so how do I find the exact reason why this doesn't work?
Edit: Adding some code below. Also, I've noticed that if I change the name to 1USD - Holding 99 - Test 2, it works without any error despite the name being longer. Automatic ChangeDetection is not enabled for performance reasons.
security = new Security
{
Name = securityName,
IsActive = true,
CreatedAt = DateTime.Now,
CreatedBy = ADMIN_USER,
ModifiedAt = DateTime.Now,
ModifiedBy = ADMIN_USER
};
_repository.Save(security); //Ctx.Set<T>().Add(security); Ctx.SaveChanges();
//some attributes with a foreign key referencing this entity are saved, which is why we update audit fields below, but error occurs regardless if anything additional is saved
security.ModifiedBy = ADMIN_USER;
security.ModifiedAt = DateTime.Now;
_repository.Save(security); //Ctx.Set<T>().Attach(security); Ctx.Entry(security).State = EntityState.Modified; Ctx.SaveChanges();
Edit 2: It definitely seems to be something else other than a connection issue since it's happening for anything ending in a 3 character combination, such as A10, B10, or 10A. 1, 2, or 4 characters seem to be fine. Still have no idea what the actual issue is, however.

Connecting to mongodb sing C# quick tour not creating db or collection

I'm going through the mongoDB Driver Documentation Quick Tour for the first time. Specifically the 2.4 version.
I've created a fresh mongodb instance at the 192.168.1.50 address, and it appears to be running correctly.
The MongoDB documentation gives the following example:
var client = new MongoClient("mongodb://192.168.1.50:27017");
#It's ok if the database doesn't yet exist. It will be created upon first use
var database = client.GetDatabase("testDB");
#It’s ok if the collection doesn’t yet exist. It will be created upon first use.
var collection = database.GetCollection<BsonDocument>("testCollection");
However, when I go on my server, and I enter the mongo console
mongo
And I list the databases using
show dbs
The output is only
admin 0.000GB
local 0.000GB
Is there anything else I should have done to make this work? I'm getting no errors on try/catch, and it appears to be running fine.
Troubleshooting
So far I've confirmed that mongodb is running by using the following:
netstat -plntu
Shows mongod running on 27017 in the LISTEN state.
I'd also be interested in knowing if there's a way on the mongodb server to view live connections, so I could see if it were actually successfully connecting.

Well the problem is that you need to create almost one collection in order to persist the created database (weird right?) i tested it with robomongo and works in that way.
The problem is that GetCollection method is not creating the target collection, you can try with this code:
static void Main(string[] args)
{
var client = new MongoClient("mongodb://192.168.1.50:27017");
//# It's ok if the database doesn't yet exist. It will be created upon first use
var database = client.GetDatabase("test");
//# It’s ok if the collection doesn’t yet exist. It will be created upon first use.
string targetCollection = "testCollection";
bool alreadyExists = database.ListCollections().ToList().Any(x => x.GetElement("name").Value.ToString() == targetCollection);
if (!alreadyExists)
{
database.CreateCollection(targetCollection);
}
var collection = database.GetCollection<BsonDocument>(targetCollection);
}

It turns out that a method I had found on how to set multiple bindIp's was incorrect. The problem wasn't with the C# at all. I found the solution here
In case that ever goes away, here's the current settings I had to follow for multiple ip's
edit file /etc/mongod.conf
Wrap the comma-separated-Ips with brackets
bindIp = [127.0.0.1, 192.168.184.155, 96.88.169.145]
My original code worked fine, I just didn't have the brackets on the bindIp.

Lookup of function RFC_READ_TABLE metadata failed for destination PP1

I'm using a C# program to retrieve table's data from SAP, the .dll files I used is from SAP .NET CONNECTOR, I got an issue when calling below statements:
RfcDestination destination = RfcDestinationManager.GetDestination(cmbAsset.Text);
readTable = destination.Repository.CreateFunction("RFC_READ_TABLE");
Error message is:
“SAP.Middleware.Connector.RfcInvalidStateException”: Unhandled Exception occurred in sapnco.dll
Other information: Lookup of function RFC_READ_TABLE metadata failed for destination PP1
The thing is, I have several items in combobox 'cmbAsset', for some items above statements executed normally but for others they didn't. Besides, I've set the attibutes of sapnco.dll and sapnco_utils.dll as 'copy to local=true', is there anything wrong? Thanks in advance!

Have you tried other RFC-functions? Are you getting the same issues? Maybe some access-rights are missing? Can you access transaction SE16? You could also try using the Business Blue Print (BBP)-ReadTable. It has some advantages and is newer.

Cannot Convert 'Account [Directory' to 'Account [Directory]'

So essentially, I installed a NuGet Package in C# ASP.Net (Day Pilot Scheduler), purely for testing purposes.
Now though, after removing it completely from my Website, I am continually getting the same errors, with assembly references etc.. (There is literally nothing wrong with them as I haven't changed ANYTHING regarding them.
Account account = new Account();
Job job = new Job();
int jb = (from j in context.Job
where j.jobType == "Customer"
select j.jobId).Single();
account.username = registerUsernameTxtbox.Text.ToString();
account.password = registerPasswordTxtbox.Text.ToString();
account.Job = jb;
context.Account.Add(account);
context.SaveChanges();
The code that is getting the errors on it is appearing on, is anything that references the class 'Account'. (so it appears on 'Account', 'username', 'password' and 'Job'
context also appears with an error, which also baffles me because I created an instance and the instance is fine.
Here is an image of the issues showing the errors too.
http://i.imgur.com/tE9YuH7.png
With error '7'. I have attempted to delete the folder it states, and it appears again after reopening the website.
I have also removed everything regarding DayPilotScheduler too but still failed on removing these errors.
Does anyone have any idea for this? I have googled it but failed to find any information regarding this.

this was due to having a "table" called 'Account' in one Class, and a webform called Account it seems. It removed the initial errors, and left me with a few more (ones that I think I should be able to fix.).

Attempted to read or write protected memory when using Entity Framework

An unhandled exception of type 'System.AccessViolationException' occurred in StatCentric.Tracker.Worker.dll
Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
I've read numerous posts on both Stack Overflow and various blogs and can't seem to find a solution for this.
I'm doing something very basic:
public void Execute(ITrackerRequestModel model)
{
PageviewRequest p = (PageviewRequest)model;
using (var db = new StatCentricEntities())
{
db.SetTimeout(60);
db.sp_Log_PageView2(p.SiteId, p.DateTimeUtc, p.vid, p.QueryString, p.p, p.t);
}
}
But this error pops up every time I try to call db.sp_Log_PageView2. This only seems to happen inside my worker role (I'm using Windows Azure).
Also worthy of note is that I'm using the Windows Azure Emulator and I am on Windows 8.1.
I've tried the following:
Doing a winsocket reset
Disabling JIT debugging (native,script, managed)
Disabling JIT debugging on module load
Followed some old posts to hot fixes that seem to be specific to .NET
2.0 and discontinued.
Did a memory diagnostic with no issues to make sure it wasn't my hardware.
I am running Visual Studio as administrator and connecting to a remote SQL Server Database hosted in Azure.
Any ideas on how to resolve or further diagnose this are appreciated.

This is not real fix but while waiting for fix from Microsoft you can use this workaround.
I have same problem. I also tried everything to solve that issue. After few days I gave up and used manual "workaround". It only took few minutes to copy and convert existing sproc calls to new ones.
Just ignore auto generated functions and manually call stored procedures. You can use auto generated classes for returned data. Copy and modify existing function and you will get easily correct parameter names and types.
Just implement partial class to different file:
public partial class StatCentricEntities
{
public virtual List<sp_Log_PageView2_Result> my_sp_Log_PageView2(
Guid? siteId,
DateTime time,
string param3,
string param4 )
{
return Database.SqlQuery<sp_Log_PageView2_Result>(
"sp_Log_PageView2 #siteId #time #param3 #param4",
new SqlParameter("siteId", siteId),
new SqlParameter("time", time),
new SqlParameter("param3", param3),
new SqlParameter("param4", param4)).ToList();
}
}

I was getting this "Attempted to read or write protected memory exception" error while using a SQL Server stored procedure that had an output parameter of type 'Date'. I tried various things without success and, in the interest of time, settled on the following solution.
1) Remove the output parameter of type date
2) Return a string via a select statement
SELECT CONVERT(char(10), #AsOfDate, 20) AS AsOfDate
3) Convert the string returned from the stored procedure to a DateTime value in C#
DateTime asOfDate = DateTime.Now;
using (var context = new DA.MyEntities())
{
var procResult = context.myStoredProcedure(myParameter).FirstOrDefault();
DateTime.TryParse(procResult, out asOfDate);
}
I'm not super happy with this compromise, but it did allow me to move forward.