I should start a project where several clients are included. There is a wcf web service controler that after a call from an specific client about a certain question it will retrive data from a server in London and then it will pass it back to the corresponding client in a different country e.g.
Clients and service are far away. the only way of transportation is through HTTP and intenet connection. Service should be able to callback also so i guess it will be dualHttpBinding.
How can I get a NullReferenceException in the following scenario?
Dim langs As IEnumerable(Of SomeCustomObject) = //some LINQ query If langs Is Nothing Then Return Nothing If langs.Count = 1 Then //NullReferenceException here
What am I missing here? Debug shows that langs is really just a LINQ queryresult without any results...
I'm working on a system where there can be 2 level of users "Admin" or "Researcher".We have the requirement to allow the researcher to change fields for a record a record, but they want the original values to stay in the record and have an admin "accept" or "approve" the changes before the real record gets updated.Has anyone run into this scenario before? I'm trying to think of the best way to do this.
I have a class exercise that I need to do by next week. The problem is that I don't know how to write it.What I have to do is write pseudocode/algorithm for a scenario.I understand that I need to use a 5 step process for it but I don't know how to turn it into pseudocode.This is the scenario (there are 3 from memory that I need to do this is just one)"you want to estimate the number of hours it will take you to complete all of the levels in a new video game based on your past perfomance with other games."
I know I need to break it down into inputs, outputs and processes? I think that's right, but I'm struggling with writing it and getting it started.I don't need to use any actual code for the exercise. I just have to do the pseudocode and a flow chart for each scenario.
I've got a problem losing session variables in an ASP/VB.NET application. The application allows searching for an item or it can show an item if provided with a unique link (in the browser). It holds information about the item in session variables. In the webpage showing an Item a user can click a button which opens a window with additional information about the item - obtained from a session variable. When I search for the item using the search engine and click the button - it works OK.
When I copy the link to a browser: the item is shown, however clicking the button returns a 'null exception' - the session variables with information about the item are lost. Moreover when I provide the link for the second time the button works, the variables are there!
I have an application that I'm writing that needs to allow the user to be able to create templates and save them for how the applicaton will work. For instance, lets say I am provisioining mobile devices, and my application allows the user to create a template to only install "application1" on the device, with "application1" settings for "devicetype1". But then if the user has "devicetype2", he or she can select the template that they created to install the software for that kind of device. I've looked around and all I find is the .exe.config for read only application settings, and I have found the user.config for the read/write variables. But that won't work as my application could have several templates depending on what the user chooses. I'm looking to have my app have a "create template", "edit existing template, and"use existing template" buttons, and have my config file extension like *.ipx for example.
I am currently debugging throught a lengthy piece of code that behaves differently if the batch loaded is created from one way or another. I have tried going through it and it seems each step is the same, so my question is, Is there a tool that will record each line of code that is hit while debugging? so instead of writing everything down and risk missing something i could just run the program use beyond compare to compare the results of both runs.
i have set the loan_id column to increment in steps of 1, but when i add a column in visual studio 2008 express it auto increments in minus steps -1 -2 -3. it increments in positive numbers?
I have just downloaded VB Express 2008 with the intention of teaching myself how to use it from scratch. Previous programming experience limited to Lotus / Quattro Pro old style macros. Preference would be to work through a good hard copy DIY manual starting from the basics.
I am ready to deploy my vb.net project to my client computer.In my development computer I have crystal report 9, sql server express and .net frame work 3.5 installed.My Client computer hasn't got anything installed there.I am trying to making msi installer so that it will be easy for my client to install.I created the new solutions -> setup type project, added the project on it and build it.it successfully created the msi installer but it doesn't installs the sql server express and crystal report.How do i make the installer with crystal report and sql server and also with db
i am creating a ticket ordering system, there is 5 - 10 step for public user to choose what they want. These steps is dynamic, can some one advice me what is the best way to store data during steps, so that i can have a back button to return to previous step or retrieve data from step when compiler at last?
I would like to know what are the basic steps involved in setting up your application to able to read data from another application. Then take that data and modify it and send it back to the application. The data being read will have over 100 fields.... what is the most efficent way to store them? Put them in a class object?
I am relatively new to the world of programming and I was wondering if anybody could help me with a small project. I am trying to create two programs in VB.Net that each do one of the following individual actions:Find the average grade given several user-inputted scores on assignments. The program should also provide the following feedback according to the final score (i.e. A, B, C, D, F).Run two separate threads printing numbers (or words) in ascending and descending orders. (The numbers (or words) should be given by the user.)I have a basic understanding of VB.Net, but I am having trouble when it comes to creating even remotely complex programs. I have a few ideas on how I may go about these, such as using an arraylist for the first question that takes user input to find the grades, and then uses a series of If-Then-Else statements to display the letter grade, and possibly using steps simply with dual threading that would result in numerical order being printed in ascending order and descending order.
I have code that runs a deal.deal is a series of conditional steps [e.g., pay Fee1 from Account2 if (Variable5 > 500, Variable5 / 2, 0)].
These conditional steps are stored as strings in an access database.The conditional part can be extremely complex.
What is the best way to get my code to understand the conditional part?Do have to write some huge parser?
Is there a function that can do this for me(something similar to application.evaluation function in VBA)?Or do I need to approach this in an entirely different way?
list the steps to fill a combobox using a bindingsource. I dragged a bindingsource onto a form, created a datatable and datatableadapter(correct term?), added a query. I tried but I am missing something, my combobox displays System.Data.
I'm interested in a description of the step-by-step process for creating a custom control and making it available in the toolbox with vb2008. Just for an example, suppose one wanted to have an array of 9 buttons in a 3x3 pattern already labeled 1-9 as a control usable from the toolbox just as a single button or label etc. is, so that one could drag it from the toolbox to the form or a groupbox.
I want to write a human resource programme that can accept employee records and compute for their salaries and overtime and also print out the needed salary slips and reports.
With a 1-many relation. Ok, I have constructed the schema, and now I want to make the appropriate forms in which a user would scroll for a customer and then by pressing a button, a new form would appear showing all the orders that he has made.
I am interested in the way of building two forms that would have a one to many relation. That is basically what I would like to know. Also, Do you have any good book to suggest in order to create a real world app, in VB2008, Emphasizing in data-binding and connecting controls with underlying DB, one to many forms, searching etc.
This is weird. I have a class that inherits from IEnumrable whose Count property is reporting 0 (zero) elements but the For Each loop steps into the loop body and tries to use the variable where it should just be moving on. My code:
On Error Resume Next Dim d As Foo For Each d In fooCollection ' use d and throws an exception Next d
Weirder still, every time d is accessed i get an exception thrown in the output window:
A first chance exception of type 'System.NullReferenceException'
but i'm not stopping on the exception (not in a try/catch block).Is "On Error Resume Next" causing this weirdness?
Weirdness found:Per Rowland's and JohnH's comments i checked the Foo class:The GetEnumerator method inside of Foo didn't actually return anything! It had an empty body. That coupled with the On Error Resume Next before the loop caused the havoc! Wow this was ugly.
I created a function that creates a global temporary table to stage data from a excel sheet I need the table to persist for me to map the columns using a form. The table is still there when the code goes back to the sub that calls the function until I call the form where I do the mapping. I am trying to avoid create/drop table scenario with a perm stage table.How can I get this table to persist until the data gets loaded into the perm table?
How can I write a connection string? I has four different computer that can be connect via ethernet.How can I maintain a inserting data if to computer insert on same table at a single time..??
I'm a little baffled why I get this error. Scenario: Printing - 6 different things to print including "Permit" and "Permit Copies". "Permit" looks like a drivers license including a photo."Permit Copies" is exactly the same except it has a piece of text at the bottom that says "Sheriffs Copy".
The problem is when trying to print "Permit Copies". Very few of them shows the print preview - most just display the FileNotFoundException error. If "Permit" pulls up the photo just fine, why not "Permit Copies?" It should be trying to pull up the same photo as "Permit" - same file path/name. Where is it wrong in my code?
