VS 2010 - Calculating Type Of Combinations Of Character

Oct 4, 2010

I have a string that can be anywhere from 1 to 8 digits long of which each character is a hex number (0-9, A-F) and each character isn't necessarily unique. I need to calculate all possible combinations. Is there a specific term for this type of calculation or combination? I need to learn how to write a program to "calculate" all the possible combinations.


VS 2010 Setting Hooks To Stop Combinations

Feb 25, 2011

To make this short and simple, I'm developing a program that goes full screen but cannot allow the user to close or Alt-Tab out of it. The program is responsible for giving out tests that teachers create for various students and, to deter cheating, I was going to have the program block attempts to close it (I have that figured out already) and stop Alt-Tabbing out of it.

I looked up SetWindowsHookEx, but I was never good with PInvoke's and my attempts to get it to work have resulted in nothing.

This is my current

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function SetWindowsHookEx(ByVal hookType As HookType, ByVal lpfn As HookProc, ByVal hMod As IntPtr, ByVal dwThreadId As UInteger) As IntPtr


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VS 2010 : Calculating Circumference And Radius?

Apr 20, 2011

im creating 2 programs for school but both have errors. One program will calculate circumference and area when you enter a radius. Heres the

Public Class Form1
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
If TextBox1.Text <= 0 Then
TextBox2.AppendText("Enter a valid number.")


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VS 2010 Calculating Perimeter Of A Triangle?

Feb 24, 2011

Calculating Perimeter of a triangle

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VS 2010 Downloader, Calculating Speed?

Dec 10, 2011

Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnStart.Click


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VS 2010 : Calculating The Price Of A Meal+taxes?

Sep 19, 2011

I need to create a simple program that will calculate de price of the meal+the taxes aswell as the tip.

The prov taxe= 8,5%
the fed taxe = 8%
and the tip is 15%

I need to use const for this one.heres what i came up with:

Private Sub partie4_click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles partie4.Click
Dim repas As String
Dim sous_total As String


The user has to type the price of the meal and then it should calculate the price but for some reason instead of *8,5% it will do x*8.5.

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VS 2010 Calculating Staff Holiday Days

Dec 14, 2010

Currently I was making a program that will store staff holidays, with a form they can fill out when they take some.The form has Holiday Start and Holiday Finish as 2 Date Fields.Also 7 Check boxes(Monday to Sunday) so they can tick which days they would normally work.The problem i have is then we need to know how many days are being taken, for example.[code]But they have ticked they only work Tuesdays and Thursdays this means they would have only took 2 days holiday.How could i calculate this say if an employee took 1 month?

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Visual Basic 2010 - Calculating The Difference Between Times?

Oct 19, 2011

I am trying to calculate the difference between 2 times.

So far I have 4 labels.

Label1 = Current date and time.
Label2 = Contains the exact time that the application was last closed.
Label3 = Contains the exact time that the application was opened.

Label4 = I want this label to say how much time in seconds had elapsed between the application last being closed and the application being opened again, in other words the difference in seconds between label 2 and label 3.

Below is what I have done so far, but despite repeated efforts I can't seem to find a way of getting the time difference to show in label 4?


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VS 2010 (One App): 24-bit Word - Creating UDP Datagram - Calculating Checksum

Sep 22, 2011

I'm trying to create an app that controls a BSS BLU-80 (DSP) through Ethernet. I've written a few basic programs in the past, but nothing that used sockets or even required calculating a checksum. One of the values I need to send has to be 24 bits. This one really has me scratching my head. From the manufacturer's docs:


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Type One Character And Control Immediately Goes To The Next Object?

Nov 11, 2010

When control passes to the textbox I type one character and control immediately goes to the next object(lbxAnnl)). I suspect it may be related to the "TextChanged" event but I didn't see any other events that looked relivent. I was expecting to terminate the input with a carriage return.


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VS 2010 Shortcut Keys (KeyUp) E.Keys Combinations?

Mar 25, 2011

I'm trying to create a shortcut which expands or collapses my treeview using the ctrl+alt+up-arrow or ctrl+alt+down-arrow:

If Keys.ControlKey And e.KeyCode = Keys.Alt And e.KeyCode = Keys.Down Then
End If


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Conversion Of A Character Data Type To A Datetime Data Type Resulted In Out-of-range Datetime Value

Jan 12, 2010

[code] "The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value.The statement has been terminated." [code]

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VS 2010 : Conversion From Type 'DBNull' To Type 'Date' Is Not Valid

Dec 30, 2011

When I close my form without saving I want to check if the data on my form has changed since the last time I saved the data.This peace of code, which I included at the bottom always worked fine.Except when I compade a DateTimePicker with a null value in the db.Than I get the error "Conversion from type 'DBNull' to type 'Date' is not valid."Probably on this peace of

Me.dtpVrijeDatum01.Value.Date <> CDate(reader("VrijDatumVeld01")).Date Or
Me.dtpVrijeDatum02.Value.Date <> CDate(reader("VrijDatumVeld02")).Date Or
Me.dtpVrijeDatum03.Value.Date <> CDate(reader("VrijDatumVeld03")).Date Or
Me.dtpVrijeDatum04.Value.Date <> CDate(reader("VrijDatumVeld04")).Date Or
Me.dtpVrijeDatum05.Value.Date <> CDate(reader("VrijDatumVeld05")).Date Or

The total code to check the changes is:

Private Sub CheckForChanges()
LeesCheckboxWaarde(Me.chkFacAdrIsBezAdr, intCheckFacAdresIsBez)
LeesCheckboxWaarde(Me.chkPosAdrIsBezAdr, intCheckPosAdresIsBez)


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VS 2010 Conversion From Type 'FileInfo' To Type 'String' Is Not Valid?

May 1, 2012

I get the error: Conversion from type 'FileInfo' to type 'String' is not valid. This happens in between try and end try

Private Sub CopyNotes()
Dim NotesBase As String
Dim NotesTgt As String


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VS 2010 Conversion From Type 'MySqlDateTime' To Type 'Date' Is Not Valid?

Apr 7, 2012

I'm storing dates intoa table like:vb.net "INSERT INTO myTable (datum) VALUES ('" & Convert.ToDateTime(dgvrow.Cells(0).Value).ToString("yyyy/MM/dd hh:mm:ss") & "'" & ")", conn) This works perfectly. After storing the dates I need to load /show them into a MonthCalendar. This is where the error occurs.


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VS 2010 Conversion From Type 'Range' To Type 'String' Not Valid

Aug 30, 2011

I have the following code to use Words spellcheck feature on a RTB. Once you pick the correct word in the spellcheck box and press change I get the error on th efollwoing line

strResult = Left(objDoc.Content, Len(objDoc.Content) - 1)

I tried to use CType() but still complains.

If (Len(t.Text) = 0) Then


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Combinations Of 16 Take By 2 Using LINQ

Oct 28, 2009

I want simply to generate rapidly combinations of 16 take by2 using linq.So I want to display me the combinations only not arrangements:1,2 (not 2,1 because there are combinations)...1,16 2,3 (not 3,2) because they are combinations..2,16..Comb of 16 take by 2 makes 120 so 120 combinations will be displayed on screen.[code]So my question is how to display rapidly on screen the combinations of 16 take by 2 using this Enumerable class of Visual Basic .NET(the 120combinations in fact)

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Detecting Key Combinations In Vb?

Aug 16, 2011

I am facing problem while in detecting the multiple key combinations ..here is my cod

Private Function keyboardCallBack(ByVal nCode As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As IntPtr


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Get Combinations With Repetition?

May 26, 2011

How can I write all possible combinations to the console? For example, if user enters abc, then it will write aaa, aab, aac, abb, abc, acc, bbb, bbc, ccc.

Here's some code:

Dim abc() As String = {"a", "b", "c"} '
Sub Main()
Console.WriteLine("Enter the amount of characters")


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Permutations Or Combinations ?

Dec 28, 2010

I think what I'm trying to do is considered a permutation but I could be wrong.  I've come across several examples of how to permutate a string as follows:

Permutations of {A B C}: {A B C}, {A C B}, {B A C}, {B C A}, {C A B}, {C B A}

What I'm needing are results similar to this (using the same input) with a repeat of each item to create a list of all possible combinations: {A A A}, {A A B}, {A A C}, {A B A}, {A B B}, {A B C}, {A C A}, {A C B}, {A C C}...and so on.

Below is some code that I found that almost gets me there with an exception of the repeated values:

'Generates all possible combinations from a series of words
Public Function PermutateString(ByVal input_string As List(Of String), Optional ByVal Base As String = "") As List(Of String)
Dim i As Long


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SendKeys And Certain Key Combinations

May 26, 2010

I'm trying to send Ctrl+A to Notepad but nothing is happening. Code for the button:


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Binding Key Combinations To Application?

Sep 8, 2009

How can I bind a key combination to my vb.net application? I know it has SOMETHING to do with the registry, but I have no earthly idea what or how to go about doing this. I want the user to be able to hit those keys when the app is open and have it execute my function, but not while the app is closed.

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Generate All Possible 3 Or 4 Digit Combinations?

May 30, 2009

I am trying to generate all possible 3 or 4 digit combinations from 0 to 9. I will be outputting them to a text file but I just need help with actually generating them.

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Generating A List From Combinations?

Aug 3, 2009

I am writing an application in which we have a Product Module, Now instead of defining individual products, we want to just state the Size Ranges in Width, height and different size scale available, and then automatically generate a list of products with all the Size combinations. I cant figure how to do this.Ill give an example.This is how we define a product


If i had a fixed number of Size types i would just run For loops within for loops and inside the inner most for loop write an Add Item statement with Index of evry selected item, however since the Size types are dynamic, i need to write a recursive loop, and i just cant figure how to.

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Generating Binary Combinations?

Dec 11, 2010

My task is to develop a Control library (VB 2005) in which u enter a variable in textbox (>=1 , <=5). Lets say you enter "3" then u have too see in table all combinations of boolean numbers for 3bits (000, 001, 010 .....etc). If you enter "4" the table have to be different (0000,0001,....etc) with 16 combinations.

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Register Two Hotkey Combinations?

Aug 16, 2008

how you can register 2 hotkey combinations.(CTRL + END, and Alt + END).I'm using this code as a reference.


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VS 2010 - How To Get True Height Of Character

Oct 29, 2011

I need to use the character height of a lowercase character. I have tried using MeasureString, but that gives me the same number for both uppercase and lowercase characters. That is not acceptable. How do I get the true height of a character?

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VS 2010 : How To Reverse Character Order

Feb 10, 2011

Text is entered into a textbox form. Upon button click, the order of characters in the words in textbox.text string will be reversed. The order of the words themselves will stay the same. For example: "I Love Visual Basic 2010." will be converted into "I evoL lausiV cisaB .0102".

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VS 2010 Making A Character Move?

Oct 22, 2011

This is actually not really a question about vb, but about how to make a code.I'm making a RPG game and I want to make my character have "normal" movement. The problem is actually when I just hold down one of my movement keys (a, s, d, w) my character will jump out of the screen because it's going to fast. here is my movement sub:

Private Sub frmMain_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown


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Achieve A List With All Possible Combinations Of Letters?

Sep 9, 2009

I was wondering how to achieve a list with all possible combinations of letters. Now there are some nice examples on the Internet, however, I'd like to have the following:

Let's assume you have 3 letters (A, B, C), and have a limit length of 3, then it should display this list:



Now, this would be fine with recursive calls I think, but I find it really difficult to think how to code that and how the computer will execute the code. It would be easier if all possibilities had a length of 3, but here that isn't the case.

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Dec 10, 2011

Example :

If a got word "don" then file will contain


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Jun 11, 2011

I want to create an algorithm or formula that gives me the following combinations below. I have manually printed out all the combinations for the example containing 4 tables with respective values.

This is not permutation because i need the combinations to always follow the unique format [code]...

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Jul 13, 2009

I would like a function generate all of the k-combinations of elements from a List of n elements. Note that I am looking for combinations, not permutations, and that we need a solution for varying k (i.e., hard-coding the loops is a no-no).

I am looking for a solution that is a) elegant, and b) can be coded in VB10/.Net 4.0.

This means a) solutions requiring LINQ are ok, b) those using the C# "yield" command are not.

The order of the combinations is not important (i.e., lexicographical, Gray-code, what-have-you) and elegance is favored over performance, if the two are in conflict.

(The OCaml and C# solutions here would be perfect, if they could be coded in VB10.)

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Mar 25, 2011

how to generate combinations of pixels on a page using 24bit color using MS VB 10.0.

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Jan 15, 2012

Example: That's 8 different combinations:
1, X, 1
1, X, X
1, 2, 1
1, 2, X
X, X, 1
X, X, X
X, X, 1
X, 2, X

Any way to get the different combinations depending on the Checked checkboxes into an ArrayList. One entry per possible combination (like the example above). Note this example is just for 3 games, I will have 13 games in my program so if you click all checkboxes thats 1,6M combinations. Is it really wise to have 1,6M entries in an Array? I also want to be able to set demands, like: delete all lines in the Array containing two X. Maybe an ArrayList isn't the way to go?

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Oct 11, 2011

Using VBNET, MVC 3 and Entity Framework to write my first mvc application - a single user blog application. I am trying to create an archive sidebar that will render something like October 2011 and when the user clicks they will see all posts in october. Right now all my attempts show either duplicate dates - if there are 3 posts in october then i see october 2011 3 times or i only get back one month year combo say oct 2011. Using groupby with firstordefault i only get back one month yaear combo.

posts = _rdsqlconn.Posts.Where(Function(p) p.PostIsPublished = True).GroupBy(Function(d) d.PostDatePublished).FirstOrDefault

How can i get back unique month year combos with EF?

Additional info: I have that function in my repository. I want to pull the month and year pairs so that i have only one pair for say ocotober even if there are 3 posts in october.In the repository:

Public Function SelectPostsByDate() As IEnumerable(Of Entities.Post) Implements Interfaces.IPostRepository.SelectPostsByDate
Using _rdsqlconn As New RDSQLConn
Dim posts[code].....

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Mar 24, 2010

If there is an array with elements: 1,2,3,4, the program should return another array with sum of all combinations:



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Oct 6, 2009

I have 36 numbers in sets of 5. (eg. 1-2-3-4-5, 2-3-4-5-6 etc..) I need to find all the possible combinations of these numbers which total the same sum. For instance the lowest sum would be: 1 + 2 + 3 + 4 + 5 = 15. The highest possible sum is: 32 + 33 + 34 + 35 + 36 = 170. Now every five number combination within these 36 numbers will sum up between 15 and 170. How would I go about this in vb.net to produce all the possible combinations which would total say 92.

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Feb 2, 2010

If I want to set my Font I can use new Font=("Times New Roman", 12, Drawing.FontStyle.Bold)Instead of Bold, I can use Italic, Regular or Underline

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VS 2008 Word String Combinations?

Apr 12, 2010

I am trying to generate a combination of string words and this is not permutations. For example if I had a list of words like (bat, cat, dog, egg...)then try and generate n(n-1)/2 combinations like

bat cat dog egg
batcat catdog dogegg
batcatdog catdogegg


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