How To Write Simple Validation Expressions
Jul 25, 2011How to write a simple validation expression that will accept any whole number greater than zero but less than 1,000.
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Validation Using Regular Expressions?
Jun 24, 2011I'm trying to do is some password validation. It needs to have at least 1 lower case character, 1 uppercase character, 1 number and at least 6 characters in length. I figured I could do this using "RegularExpressions" however I can't figure out how to determine the "at least one occurance" of each. For example I thought the following would work but it only validates that what is input is a lower case, uppser case or numeric character, not that the input has at least one of each. The user should be able to enter any characters but at least one of lower case, upper case and numeric characters.
Dim
myMatch
As
Match
[code].....
Implement Very Simple Validation Into A Program?
Mar 30, 2010I'd like to implement some very simple validation into a program I'm writing, but I have no experience in this area, so I'm not sure how to implement it.I'd like one to have one make sure that text entered in to a text box has only regular characters (A-Z, a-z), but I'm not sure how to go about it!
View 3 RepliesWrite Simple CAD Software?
Dec 17, 2011I was just wondering if there are any examples around the internet on how to develop a simple CAD program.
Would I be better off drawing on the form directly or use a Panel or a PictureBox for that?
Input / Output Methods And Validation (for Secure Coding) - Read/Write DB Encryption ?
May 16, 2011I've been trolling for a long time now and have decided to register as I finally have some time to start jumping into VB. The last time I coded VB, the current version was VB 4. I've been out of programming for a good while now and considered myself a beginner (tutorial example coder haha).
My question is: Where is a good place to start learning VB.NET?
I know it's an often asked and answered question - but let me give you a bit more information so more specialized replies might be given.
I'm in INFOSEC/COMSEC and would like to (eventually) develop a program that contains a DB of information that is read by the application and saves input information into a DB (encrypted) as well. The program will be a 800-53 C&A control assessment program; used for tracking system compliance for federal information systems. I would like to be able to develop such a tool to make my life easier at work instead of using Excel spreadsheets to track everything.
I would like to learn:
- Input / Output methods and validation (for secure coding)
- Read/Write DB Encryption (RSA or other 128-bit) for user input information
- Ability to generate PDF reports from the primary keys and data sets from the above DB
My goal is to create a program that allows a user to install the program, setup a 'master' account that a serial/key has been generated for - that master account is then allowed to create new projects (progress saved in DB). A project asks the user certain questions pertaining to information systems and takes the input and saves it into the DB (encrypted). When the assessment is completed, I would like the program to be able to generate a PDF report from the DB (from a layout template I created).
Write A Simple Expression-like Class In .NET 2.0?
Jul 7, 2010I'm currently working in .NET 2.0 Visual Basic. The current project is an Active Directory Wrapper class library within which I have a Searcher(Of T) generic class that I wish to use to search the underlying directory for objects.
[Code]...
In short, I want to offer some kind of Expression feature to my users, unless it is too much work, as this project is not the most important one and I don't have like 2 years to develop it. I think that the better thing I should do is to write something like CustomExpression that could be passed in parameters to some functions or subs.
Write A Simple Sine Graph?
Mar 21, 2011How to write a simple sin graph for my calculator? I need , when I'll press the button, to show this graphic.
Private Sub btnsin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnsin.Click
For i = 0 To 100
[Code]......
Write Simple Program To Run In Vdraft Using It's Api?
Jan 20, 2009First I'd like to say I am not fluent in Visual Basic, I down loaded Express 2008 and have easily completed the first few lessons. I have some programing exerpience. I have written a few simple programs with Autolisp for Autocad.Vdraft will only integrate with full blown VB programs. So, Maybe someone can write a simple program using Vdraft api which can be found at :
View 1 RepliesWrite Simple VB Code With *= Operations
Apr 18, 2010I've designed a Arithmetic Calculator. I can get my additon button to work but not my multiplication button. My result total comes back as 0.
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How To Write Simple Envelope Printing Application
Feb 16, 2011VS2010 VB.Net Windows Form (not WPF). Any Hello World level example for printing the text within a multi-line text box they can post? Ditto for a print preview? I need to write a simple envelope printing app and I need a good base to build upon.
View 3 RepliesRead/write A Simple Text File In Net 2008?
May 9, 2010I am trying to read/write a simple text file in net 2008 but can't, as yet, get it to work. This is how I use to do it in VB6
Code:
MyStr = App.Path & "DataData.txt"
Open MtyStr For Input As #1
[code]....
Simple Read/Write App.config Configuration File
Feb 6, 2010I have a program with various settings, all stored in the app.config file. Often, I have a need to edit the connection string setting. I cannot do so using the My.Settings.myConnectionStringVariable method, as this is read-only. What I would like to do is have a big text box, and simply load the entire app.config file into it. The user could modify whatever they wanted, click save, and the program would save the new edits to the app.config file, and restart the program. I don't have a huge need to only pull out the connection string, as getting the text for the entire config file would suffice. However, if it is easier to pull out just the connection string from the config file, that would work too.
View 1 RepliesWrite A Simple Game On Which The Player Has To Pursuit Some Figures On The Screen?
Oct 16, 2009I'm currently trying to write a really simple game on which the player has to pursuit some figures on the screen. Since i'm just writing the prototype version i'm using a Panel wich i redraw 1000 times per second. Now, i want that every level is similar but not the same as past level, so i created a Level Class that contains the game objetcs of Player Class and the Figure Class, wich are the ones that have all the movement subrutines. So, with a Timer, 1000 times per second, i get the input from a joystick, pass it to the player objetc and update the position of the figure object. All this stuff is reported to an internal Panel that every level object has, wich i refresh and then pass it ByVal to the panel that the player actually sees. The problem i have is that after the first level ends, when the second level starts running, i can see the last frame of the fisrt level flashing behind the figures and it makes the game run a bit slower after every level. I tried keeping a copy of the inicial state of exterior panel and use it to clean the one i'm using on the levels but it didn't work...
View 11 RepliesWrite A Simple Program Which Will Simply Have Buttons To Open Spreadsheets?
Jan 12, 2009I am trying to write a simple program which will simply have buttons to open spreadsheets, and a search facilities to look for spreadsheets with a title which is an invoice number. I have my basic forms layed out, all a need now is help with the code.
I am using Visual Basic 2008 Express, and just need a line of code for a button to open an application/spreadsheet. Also, is it possible to have a search box open a file automatically?
Write A Simple Windows Form That Will Make It Easy To Record A Voice Message Before Uploading It To A Remote Web Server?
Oct 2, 2011I'd like to write a simple Windows form that will make it easy to record a voice message before uploading it to a remote web server and sending the URL to the recipient(s):
[URL]
Currently, the user has to use Sound Record to record the message, use an FTP client to upload it to a web server, and finally, use an e-mail client to send the URL. I'd like to combine those three features into one.
Post A Simple Code Using VB That Start Building Simple Games?
Jun 10, 2011Is there anyone can post a simple code using vb,that start building a simple games ?
View 2 RepliesDirectory Listing - Write A Simple Program That Will Let Me Choose A Directory And Get A Listing Of All Files?
May 8, 2010All I am trying to do is write a simple program that will let me choose a directory and get a listing of all files in that directory and its sub-directories and show it in a RichTextBox. I got as far as being able to select the directory but when I click "OK" I get "access to c:documents and settingsstevedesktopmp3 is denied".The code I am using is listed below.
Imports
System
Imports[code].....
Make A Simple Browser With Some Simple Addon's?
Dec 9, 2011Trying to make a simple browser with some simple addon's. What Ive done is setup a menu(forum) for the user to enter their email providers web address and it will save it in a xml file. When they click on the email link, it should load the email xml iformation and place that info in the tb_html.text and navigate. I keep getting a null exception and im not sure what going on here. Here is the code:
Browsers:
Private Sub btn_Email_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Email.Click
'Load Action
Dim SavedEmailObj As Storage
[code].....
C# - Use Or Not Lambda Expressions?
Nov 11, 2009I see lambda expressions have become a very useful tool at some points in the language. I've been using them a lot and most of the time they fit really nice and make the code shorter and perhaps clearer.
Now.. I've seen some , I would say excessive use of them. Some people like them so much that try to use them everywhere they can.. Some times the C# code looks like a functional language. Other factors against are the cost using reflection by lambda and that not friendly to debugging.I would like to hear opinions about how good and how code clear it is to use more or less the lambda expressions. (this is not the better example, but let's say it was the trigger)I was writing the following code. The use of the delegate { return null; } helps me avoid having to ask if the event is null or not every time I have to use it.
public delegate ContactCellInfo.Guest AddGuest();
public event AddGuest GuestRequest = delegate { return null;}
Im using resharper and the wise resharper( even it some times literaly eats the memory) made me the following suggestion
public delegate ContactCellInfo.Guest AddGuest();
public event AddGuest GuestRequest = () => null;
At my point of view the code using the delegate looks clearer. I am not against the Lamdba expression just would like to hear some advices on how and when to use them.
Evaluate All The Expressions?
Jan 4, 2010if i do not need to evaluate all the expressions, am i right to say that there are benefits and no disadvantages of using AndAlso compared to using And
example:
if a=b And f=g And y=k
can be better done with:
if a=b AndAlso f=g AndAlso y=k
Lambda Expressions In C# Vs. .net?
Jan 20, 2010Functionally, is there any difference (apart from syntax onbviously) between lambda expressions in C# and VB.Net?EDIT: following up on CraigTP's answer: any references to the situation in .Net 4?EDIT: I'm asking because I'm used to C#, but for a next project the customer asks VB.Net. We're not a priori against that. We realize that most language constructs are supported in both languages. However, we're particularly fond of the way C# implements lambda expressions. We would like to have an overview of the differences with VB.Net
EDIT: accepted CraigTP's answer for pointing out what I currently consider the most important difference.
So to summarize: VB.Net 9 does not support multiline statements in a lambda expression, and a lambda must always return a value. Both of these issues are addressed in VB.Net 10
NET 8 - Add General Expressions?
Apr 25, 2012I wish to incorporate general expressions in my Visual Basic work.Other than the basic inputting "Imports System.Text.RegularExpressions", I have no idea how to do put general expressions in my VB project.However, I can create the expressions (so, all is not lost).
View 1 Replies.net - Are These Expressions True Or False
Feb 20, 2011The expression 3>6 AndAlso 7>4 evaluates to
A. True B. False
The expression 4>6 OrElse 10<2*6 evaluates to
A. True B. False
The expression 7>=3+4 OrElse 6<4 AndAlso 2<5 evaluates to
A. True B. False
C# - .NET Async Lambda-expressions?
Apr 20, 2012Async Sub like this: Dim f As Func(Of Task) = Async Sub() End Sub Produces compiler error: error BC36670: Nested sub does not have a signature that is compatible with delegate 'System.Func(Of System.Threading.Tasks.Task)'.Equivalent C# code compiles fine:
Func<Task> f = async () => { };Rewriting Async Sub into Async Function make code works.
Why does Async Sub() is not convertible to delegate types with return value of type Task?
C# - Regular Expressions For Class Name?
Jan 15, 2011i need a regular expressions string to get all anchor tags in a page with a specific css class name, in c#/vb.netthis is what i got so far"<a.*?href=""(.*?)"".*?>(.*?)</a>"ut my attempts to add "class=name" isnt working, also is it possible to find links where the class name appears either before or after the href with one expression
View 4 RepliesConverting Lambda Expressions To .net?
Jul 4, 2010how to convert this code to VB.net, can anybody help?
public static readonly DependencyProperty CommandProperty =
DependencyProperty.RegisterAttached(
"Command",
[code]...
Evaluate Algebraic Expressions In VB NET?
Mar 30, 2011I am looking for a way to simplify algebraic expressions in VB.NET. It is preferred if you can give me a link to a pre-written library or class.
View 1 RepliesExecute A Statement Only If Both Expressions Are Met?
Feb 13, 2011I am new to VisualBasic and trying to learn it online. For my first assignment I have to make a program that allows someone to input a time in AM/PM and select the time zone and automatically output a picture and three other time zones. I think I have it for the most part but I am having an issue with one part in particular. Since the time is input using AM or PM if the original time is 11:00 AM and I add an hour it should switch to PM. But I'm not quite sure what I'm doing wrong. I basically need to say If the time is equal to 12 and the meridiem is equal to am then it should switch to pm but I keep getting errors inidicating they are trying to switch to a boolean value.
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Possible To Make An Array Of Expressions
Nov 14, 2009I'm in a Collage VB.Net Class and I was wondering if it is possible to make an array of expressions like : Dim exps() = { 5*4,2+3,5*2}.
View 3 RepliesRegex - C# Using Regular Expressions?
Nov 11, 2011The following works in vb.net, and basically only allows characters on a standard US Keyboard. Any other character pasted gets deleted. I use the following regular expression code:
"[^A-Za-z0-9[{}]`~!@#$%^&*()_-+=\/:;'""<>,.|? ]", "")