# C# - Calculate A Formula Which Changes Value Each Day?

Feb 25, 2009
I use the following columns stored in a SQL table called tb_player:

Date of Birth (Date), Times Played (Integer), Versions (Integer)

to calculate a "playvalue" (integer) in the following formula:

playvalue = (Today - Date of Birth) * Times Played * Versions

I display upto 100 of these records with the associataed playvalue on a webpage at any time.

My question is, what is the most efficient way of calculating this playvalue given it will change only once a day, due to the (today-date of birth) changing? The other values (times played & versions) remain the same.

Is there a better way than calculating this on the fly each time for the 100 records? If so, is it more efficient to do the calculation in a stored proc or in VB.NET/C#?

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Oct 11, 2011

Using VB.Net (Windows Application)[cod]e...

f1 = a + b * c means i have to pass the value a = textbox1.text, b= textbox2.text, c = textbox3.text

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Sep 27, 2010

It's possible to calculate a string that has a formula something like:

dim val as integer

dim formula as string = "(5/1.5) + 10"

val = formula

And the result should be 13.33

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Jul 15, 2011

I have a text box for user key in a formula,like '1+3-5',and i need to solve and display the answer.

Also need to handle the brackets,like '9+(2*4)'.

Operation is plus,minus,multiply,devide.

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Aug 27, 2011

I have the following columns : (Using Excel Formula)

A B

------------------------

1 | Date | Value |

------------------------

2 | 8/20/2011 | 92.8 |

3 | 8/21/2011 | 92.4 |

[code]....

I want to calculate the difference between 1st Value (B2) and last Value (last populated row in column B)

Edited :

Using formula : =B2-B6 is not what's required. (I want diff in Cell C2)

I want when the user enters the value in B7 it automatically shows the difference between B2 and B7, when he populates B8 then it shows the diff between B2 and B8 and so on.. I don't want some direct method to do this in Excel and not by iterating all values to check the last value.

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Feb 20, 2009

I want to place two radio buttons in so I can select one of them to use one formula, and then select the other to use another formula. I want to use the I=P(1+r)^n formula and I=P(1-r)^n formula with the radio button text showing Appreciation and Depreciation.

Heres my copy of the original code.

Public Class Form1

Private Sub cmdExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdExit.Click

End

End Sub

[CODE].......................

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Mar 30, 2009

I am trying to calculate the number of years for my calculate age event handler, however i am apparently missing a method or whatnot because im trying to calculate the age , can anyone suggest help on this. I need to subtract years to get my age but when i try the birthdate.Subtract (currentDate) method i get an error about not able to convert from LONG?

So below is what I have.

Private Sub btnCalculateAge_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculateAge.Click

Dim currentDate As Date

Dim BirthDate As Date

Dim Age As Long

[CODE]

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Jun 2, 2011

check the attached 2 file. one is .docs file another is .bmp file. Problem is that i want add that formula in database through vb.net. what will be data type in sql serve? and how to manage in vb.net??

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Oct 9, 2009

I am reproducing a program written in C to vb.net and I am getting different results on a math formula. I am sure it is something simple that I am overlooking. Here is the formula in C

num = (10 * 9 * 80900 * 0501) & 0xffff;

Here is the same formula in vb.net

num = (10 * 9 * 80900 * 0501) AND &HFF

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Apr 1, 2009

how to generate the formula. want to use arraylist to store and for loops to loop the formula til the system can detect which staff it should giv the ticket to..below is the scenario:this is a helpdesk system..so each ticket they submit muz be auto assigned to a staff to attend their ticket..each staff has a different quota..so i came out wid this algorithm on hw to determine who the ticket shld go to..

for ex: i set one ticket's quota is 7%

staff A's quota - 47% staff B's quota - 35% staff C's quota - 18% so to knw how many tickets A get den B getx 1 ticket and how many tickets B get den C gets 1i came out wid a calculation like this -

Staff A - 47% / 7% = 6.7(max no.of tickets he can receive foe a period of time)

Staff B - 35% / 7% = 5

Staff C - 18% / 7% = 2.5

so first i compare A&B whr i took 6.7/5 = 1.3 -> so every 1.3 ticket A gets,B gets 1 ticket den i compare B&C whr i took 5/2.5 = 2 -> so every 2 ticket B gets,C gets 1 ticket i wanna implement this concept in my code..but i dunno how to come up wid this formula..

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Jul 3, 2009

First the requirements: By management requirements, I can't use open source code. I need the users to define their own formulas for a project. My users don't know how to code. The formulas need to be saved somehow, and being read later. I need to debug the formulas written, so I need to be able to see and understand them. The formulas used are quite specialized and specific (actuarial formulas). Adding new formulas (functionality) must be done in fast and maintainable way.

[Code].....

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Apr 25, 2012

I need a code that will convert decimal to binary. My current code doesn't work and just crashes, any suggestions on what I should do

For i = 1 To 17

Me.lstDec.Items.Add(i)

[code].....

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Jun 11, 2010

I have a formula, found in an Excel sheet that I have to convert to vb.net...I can't figure it out, eventhough it's seems a quite easy formula to me.the formula is: Mod(X + Int(Y/100000);20)In fact if I render some values...and use the Mod function in Excel or in VB.NET it gives me other results.

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Mar 23, 2010

I have made calculator in visual basic that can calculate the costs of products. You first select the type of product. Then you insert the dimensions. After that it calculates de costs. The type op products are stored in a Access database. In this database is stored a formula as a string. The problem is that i can't caculate the selected string with the formula and the given dimensions.

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Apr 27, 2011

In the user input of a textbox I would like that the user can input a formula to make it easier for him. So instead of inputing 400 I would like the user to have the possibility to input as 8*50. Is there a command for vb2008 to calculate the answer of this formula inputed by a string ?

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Mar 30, 2011

I'm trying to create a calculator that does this formula : Amount=Principal*(1+InterestRate) The point of it is to Calculate the compound interest earned over however many years the user selects between 1-15 from a listbox. The user also inputs the investment & interest rate. When calculate is clicked the results show in another listbox below.

year 1 $$$$$$

year 2 $$$$$$

etc

[Code]....

I stopped the code at Year 2 as it repeats the ElseIf to EndIf unitl selectedIndex = 15 & intYear 16.

it works for Year 1 but the problem comes with Year 2-15. it needs to take the value from the previous result in lstOutput and use it in the formula for principle.

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Apr 20, 2009

I have created crystal report for billing summary purpose in windows application.I have sorted out my data on billdate. now i want to claculate subtotal on datewise in crystal report then how to write the formula for that.

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Jun 21, 2011

I want to write a formula to SUM from column B4 to M4, this should be done using vb.net programming.

I tried using the following stuff:

oXLWsheet.Range(4, 14).Formula = "=SUM(oXLWsheet!$B$4:M$4)"

"=SUM(B4:M4)"

"=SUM(B4,C4,D4,E4,F4,G4,H4,I4,J4,K4,L4,M4)"

Nothing is working for me. I'm getting the following error when I run the code:

"Exception from HRESULT: 0x800A03EC".

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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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Apr 4, 2011

I am using Crystal Report 10.5.3700.0. I have created a report which is using stored procedure. Now from vb.net code (in VS2005) I set the selection formula like: proSaleByPerson;1.PersonsId=1

But when the report load its giving following error "Query Engine Error 'ADO Error Code:0x'", Failed to open a rowset. Keep in mind that all other reports are working fine only that reports creat problem which are using stored procedure, when setting the selection formula.

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Jun 5, 2011

i have a problem with my crystal reports selection formula, i have two forms form1 and form 2. in form 1 i have combobox where you can select the values to appear in form2 crystal report viewer but when i run form1 and select an item from dropdownlist visual studio throws an error this my selection formula "{StaffInformation.Specialty} LIKE '" & Form1.combobox1.text & "'"

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Dec 29, 2008

I'm creating a Macro for reporting purposes and trying to create a formula that will look at a prior days report, save it out, and work off of that one.

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Jun 21, 2010

How can I print a mathematical formula in a form? For a example I found in wikipedia a guide to do it in HTML: [url]

[URL]

But how can I do it in VB2008, showing the formula in a form?

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Dec 4, 2010

While learning to Orientate of the Last layers of a rubik's cube, I thought that it would be fun to make a vb.net application for it(I know that it's super hard to do)I'm starting around the center cube, but was wondering if I did a part right..I'm working with squares, and was wondering the length from one corner to another. [code] Trying to figure out the distance from the top left to bottom right,I used the distance formula to test it out and got 70.71067811865475 sqrt((-50-0)^2+(-50-0)^2)Is there an easier or more efficient way to get this number than using the distance formula?

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Dec 23, 2010

i am currently making a project which is to make a cinema screen booking system. Im a beginner of course`*My main problem is that although i have most of what is working i need to find a formula to give the full result (overall price) in a label.*My other problem is the fact that when i interact with my form certain things dont auto refresh when i change certain values e.g i change number of seats but it doesnt auto refresh the price from times1 to times2. OR i click one discount radiobutton which works then another after but nothing changes and it keeps the first radiobutton's value.Okay in my menu i have a ComboBox (ComboBoxScreen) for choosing the film and there are 3 films to choose from in the drop menu each with their own price.I also have a Textbox (NumberSeats) for inputting a number of seats you want to book for the chosen film.And lastly there are 3 radio buttons each with different discounts.. e.g No discount, 10% off and 25% off. If selected each gives discount to full price.A formula to work out the overall price uses all three functions/tools above.My current code for the combobox and radiobutton part is as follows: [code]

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Jul 6, 2011

i am currently making a project which is to make a cinema screen booking system.My main problem is that although i have most of what is working i need to find a formula to give the full result (overall price) in a label.

My other problem is the fact that when i interact with my form certain things dont auto refresh when i change certain values e.g i change number of seats but it doesnt auto refresh the price from times1 to times2. OR i click one discount radiobutton which works then another after but nothing changes and it keeps the first radiobutton's value.Okay in my menu i have a ComboBox (ComboBoxScreen) for choosing the film and there are 3 films to choose from in the drop menu each with their own price.I also have a Textbox (NumberSeats) for inputting a number of seats you want to book for the chosen film.

And lastly there are 3 radio buttons each with different discounts.. e.g No discount, 10% off and 25% off. If selected each gives discount to full price.A formula to work out the overall price uses all three functions/tools above.My current code for the combobox and radiobutton part is as follows:

QuotePublic Class txtSeats 'name of form of which is being used'

Private TEN_DISCOUNT_Decimal As Decimal = 0.1D

Private TWENTY_DISCOUNT_Decimal As Decimal = 0.25D 'percentages?'

[code]....

Where FilmCost is the price of each individual film (one is £4.25 shown above)OR lblCost is filmprice times seats.Where TotalDiscount is the discount worked out.Where TotalCost's is a value that can be shown in a label as the overall price.

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Jul 17, 2009

How do I fix a formula where that results in error# when divided by 0?

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Jun 16, 2010

I have a question about storing formulas on a database and bringing them back in as a string. I want to have the user enter in a width and that number will be passed to intWidth. Lets say a user enters 8 into txtWidth, strRange will = "Less Than 10" and in the database I will have a Width_Range column with "Less Than 10" and a corresponding Equation column to go with it. If I have a formula such as (1800 * 1.8) saved in that database column, the code I have works and does the calculation.

[Code]...

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Jul 26, 2011

I have complex formula calculating the value of a cell and it calculates the value for me. I want to get rid of the formula from the cell and want to retain the calculated value.

I have :

Dim range As Excel.Range = getRange()

For Each cell in range

' What should do to retain the value and get rid of the formula in the cell.

Next cell

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Jul 22, 2009

i am generation a excel sheet from vb.net and have a question on inserting a forumla from vb.net into an excel sheet.

I am creating this sheet out of vb.net but with a statement like this:

worksheet.cells (1,10) = "myvalue"

For my formula i need the read cellnam like "A1". But i have only the value cells (x,y). How can i get the real cellname for my formula or how am i able to insert a formula with the given information (cells(1,1))?

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Aug 27, 2011

i got two columns in mysql 2005 Grade and Remarks i need to do is.. when i input integers in grade column 1,1.25,1.50,1.75,2,2.25,2.50,2.75,3 then Remarks will show PASSED and when Grade is 4 up remarks will show FAILED(OPTIONAL)if Grade is null then Remarks will show UNKOWN this is my code but it doesnt works on sql computed column formula IIF(Grade >=4, 'Failed', IIF(Grade IN (1,1.25,1.50,1.75,2,2.25,2.50,2.75,3), 'PASSED','UNKNOWN'))

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Oct 10, 2010

Sub Main()

Dim NumberofItems As Double = InputBox("enter a number", "enter a number")

Dim Number As Double

[Code]......

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Mar 18, 2009

everything in the code works except for 1, in line txtTotal.Text = (Val(txtHomeTax.Text) + Val(txtLandTax.Text)) is where i think I'm having troubles. it shows 0 everytime, I use val but it still shows 0. but if I remove the val, it will show both numbers together

Public Class frmMain

Private Sub btnGenerate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnGenerate.Click

[code].....

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Mar 24, 2011

I am going to publish my program soon. As for the product serial activation, I have combined the user machine's CPU ID and the MAC Address to make a formula. Here is the class code to find processor ID and MAC which I have found on net and used :

Friend Function GetProcessorId() As String

Dim strProcessorId As String = String.Empty

Dim query As New SelectQuery("Win32_processor")

Dim search As New ManagementObjectSearcher(query)

Dim info As ManagementObject

[Code] .....

There a few questions I want to ask to be sure about my program activation :

- These 2 function code, Are they safe to use ? Is there any possibility that one of them or both doesn't return anything ? ( because of user permissions,os type, etc...)

- Is it possible that somehow the user machine won't have MAC Address?

- Is Proccessor ID a Unique serial for each machine in the world?

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Apr 12, 2011

I have 2 coordinate points, lets say C1 and C2.

C1 has a circle around him, with a diameter of lets say 20px.

Now the problem is, i need a formula to check if C2 is in the circle of C1.

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Aug 20, 2010

=Floor(3675/500,1)

What is equavalent code for floor formula?

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Nov 26, 2009

I am trying to make a loop to calculate the total costs for 12 days of costs. It has to compound sort of though. I need the total = cost for day 1(includes day 1) + cost for day 2(includes day 1 and 2) + cost for day 3(includes day 1, 2, and 3).....up to day 12. I have a for/next loop in my array, but it calculates the total for 12 days, but I need it to add as explained above. I have been strategizing and the program needs V= day 1 then add V to T. Then V needs to clear and then loop again so V=day 1 + day 2 then add V to T. Then V needs to clear and loop again so V=day 1 + day 2 + day 3 then add V to T and clear V.........up until all days are added together. If anyone has any suggestions or any idea of what I am talking about please comment! Here is the link to another forum that might explain the program in more detail:

Here is the code for my program so far:

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Aug 26, 2009

I want to enter a formula in VB but don't know how to proceed.

The formula I use in Excel is as follows

=IF(B2="A",M2*20.27)+IF(B2="B",M2*15.96,0)

How can I write a formula to make the same thing work in VB

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Nov 14, 2010

I'm relatively new to VB, started a programing course in Uni recently What I'm looking to do is to add the following formulae into the program.

[Code]...

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Aug 18, 2006

Does anyone know how I can include an existing dimensioned integer in VB code in a formula when using location indices (either R2C2 or R[2]C[2])?

I have integer Location set to the value 6 in some earlier programming steps, and now I'd like to be able to create other formulas and someimes use this Location integer into these formulas. More specifically at the RC and R[]C[] locations in formulas.[code]...

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