# Function Command To Solve Equations In Textbox

Feb 3, 2010

Similar to using VAL(a\$) to return the numerical value of a string, is there a function for returning the solution of an equation that is user-typed into a textbox? For instance, user types F\$=(a+b*x)/(c*x^2-d*x^3) where the variables of the equation are either pulled from a textbox or derived within the code. I am looking for something like F=Solve(F\$).

## VB Program To Solve Linear System With Any Number Of Equations?

Oct 28, 2009

I need a VB.NET program to solve linear system with any number of equations

## Solve Date Difference Function?

Apr 20, 2009

I am taken DateTimePicker2, DateTimePicker3 n textbox6.Now i wanted to display the result of subtraction of these two dates(DateTimePicker2-DateTime Picker3) in textbox6 automatically. I don't want to enter the result manually. Plz hlp me I need it badly. I hav already tried in lost focus event also its nt workin.

## VS 2008 - How To Solve Equation That Is In Textbox

Oct 31, 2009

Let's say I wrote 1+1 in a text box1 how to get answer in a text box2?

## Finding The Roots Of Equations?

Nov 13, 2010

I am trying to make a program to calculate the roots of a polynomial equation using the bisection method. I have designed the program so the user input a range of x values (x1 and x2) to solve for the root. When I debug the program I keep getting zero for the root. I know there must be something wrong the way I have my loop setup that keeps giving me a zero root. Here is what I have so far

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim x1 As Double
Dim x2 As Double

[code]....

## VS 2010 Using PEMDAS For Equations?

Oct 25, 2011

I'm working on a calculator. So far I've made it so you can type in an equation with as many numbers as you want like 5+6-12*3/4 and it can solve it. My main problem now though is that it's solving the problem left to right instead of using PEMDAS. For example 2+6*2 should = 14 but when I type it in it will give me 16. My calculator isn't using parenthesis or exponents so I just want to put the multiplication, division, addition and subtraction in order when solving.Could a more experienced coder give me some pseudocode to make this possible please? So far for the calc I've been using regex a lot. Is there a way to achieve this without regex?

## Calculating Values Of Several Equations In Application

Apr 21, 2012

I have to calculate values of several equations in an application. For example, one these equations could be:

d = a + b*z + c*z (this is what is being displayed to the user, assume that 'a', 'b' and 'c' are provided as textboxes, assume that z is a hardcoded value for now)

Now, the user could enter a=1.5, b= -0.5 and c = -0.6 (or even 'a' could be negative). So, I just tried a sample code for simple values but to no avail...

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Dim val1, val2, val3_calculated, first, second As String
first = "8"
second = "3"
Dim arr(10) As String
[Code] .....

Error:
But it throws an error saying that I am not using any databind control.

Concerns:
First of all, is it necessary to use this "eval" operator in here? Is there any way to keep "-0.5" with the sign in asp.net using vb?

## Configuring Code For Equations To Show In Listbox?

Apr 26, 2009

I am working on an assignment for Visual Basic, trying to write a program that will enable a user to enter a number and have it display that number and show in a listbox how it would multiply with numbers 1 through 12. An example of this is:

5 X 1 = 5
5 X 2 = 10
...

[code]......

## Create (fast) Mathematical Equations At Runtime

Jun 16, 2009

Is there a way to create new mathematical equations at runtime? Obviously you can pass new variables to a given equation, but I need to make a new equation altogether (then give it variables).

[Code]...

## Return Value For Command.ExecuteNonQuery Function

Apr 3, 2009

What value will be returned from below execution with select, insert, update, delete?

Dim L_EXECUTED_NO1 As Integer = command.ExecuteNonQuery()
Dim L_EXECUTED_NO2 As Integer = command.ExecuteScalar()

For example, I tried "Dim L_EXECUTED_NO1 As Integer = command.ExecuteNonQuery()" with Update SQL statement and that returned "-1". But it returned 1 for Delete SQL statement.

If Query_SQL("EXEC SP_ATT_CLOCK_INOUT_UPDATE '" & L_TODAY_DT & "', '" & L_EMP_ID & "', '" & L_START_TM & "', '" ) = True Then
MsgBox("Successfully saved!", MsgBoxStyle.Information)
End If
Function Query_SQL(ByVal SQL_Query) As Boolean
[Code] ......

## VS 2008 SQL Command With Join Function?

Oct 1, 2009

this is the statement:select ITE.stock from orderdetails ord join ITEquipment ITE on ITE.product = ord.productnamey goal is to retrieve the stock from ITEquipment depending on the name of the product which has to match from orderDetails table. when I try this on the SQL SMS I get stock in two records of stock (for some reason 2 not 1, I should get 1)and then I try to use it in my application it returns a full set of records from orderDetails table instead of one record from the ITEquipment.

## Get The Equations Of Calculations From Application To Microsoft Word File?

Jun 16, 2011

I found a great way to get the equations of calculations from application to Microsoft word file with MimeTex here-[URL]

But unfortunelly the code is only for Microsoft Visual Studio Solution under the Eq2ImgWinForms folder, but I use on my application Visual Basic language (Visual Basic 2008 Express Edition).

how could I use the same thing on my application with Visual Basic?

## Command Parameters Procedure Or Function Has Too Many Arguments Specified

Nov 4, 2009

I don't know where the extra character 'N' is coming from, there should only be one parameter coming from my SP which is the ID:

cmd1 = oStringConnection.SetCommand(sqlConnectMain, _
cmd1, "TestStoredProc", _
DBConnections.myType.cmdAsProc)

[code]....

When I ran the SQL Profiler, I found this:

exec TestStoredProc @StudentID=N'12345'

## Save Button Command Not Function And Have An Error?

Apr 23, 2010

here is my code for saving ..why it's not functioning... when i clicked no data in database..  no data at all and have an error Execution Failed:ORA-01036: illegal variable name/number what must i do..

[code]...

## Code - Calculations Are Not Being Excecuted Properly - Ertain Equations Are Being Done Before Certain Terms Are Defined

Dec 10, 2009

Due to the way I currently have it setup, the calculations are not being excecuted properly. I've been tweaking for a while and haven't gotten it yet. I think the problem is that certain equations are being done before certain terms are defined. If I click the calculate button multiple times, it works fine, but I need it to function on the first click.

Take a look:

Public Class frmford
Dim Make, Model, InitialPrice, Options, AirConditioningTax, GST, PST, Total, Subtotal, APR, Months, RoofRack, SunRoof, SideAirBags, TintedGlass, RearSpoiler, GPS, PowerLocks, FreightAndPDI, AirConditioning As Single

[CODE]...

## Publishing In Visual Studio 2008 Or 2010 - Application - Quadratic Equations

May 6, 2011

I've made a fairly good Windows form application to solve quadratic equations, but I am having a hard time understanding the publication process microsoft uses in Visual Studio. I'd like to distribute my programm as freeware on my blog.

## PathName In Shell Function With Arguments And Command Line Switches

Jul 10, 2009

I'm using VB2008 Shell function to execute file with arguments. But I'm not sure how should look my PathName in Shell function with all necessary arguments and command-line switches. Without arguments: [Code]

## How .net Solve Dll

Jun 7, 2012

how .net solve Dll problem??

## Solve Matrix In VB?

Mar 15, 2012

This is my matrix. I want to solve C,D and E

sample codes to solve C, D and E in VB.Net?

Answers are C=0.4857143, D=0.0000000 and E=-0.1428571 (manual calculation)

## Execute A Command From A Textbox

Jul 18, 2009

Lets say i have a text box and i type picturebox.visible = false; then i press a button to execute it. and My Picturebox is not visible now.so How do i run that command since it was in a text box???

## VB Form TextBox Command?

Dec 12, 2009

I have a form, with one textbox. This textbox should be useable with commands such as examples:/title TITLE OF FORM so the form title is TITLE OF FORM (without /title infront) - I have tried with splits, serveral of string formats and much more but without any luck and i don't seem to find it on google with search tags: TextBox, Command, Strings etc.

## .net - Solve Procedure And Functions In VB?

Mar 2, 2012

I have this home work question and I don't know what I am doing wrong there are a lot of errors which I don't know how to correct. This the question:An automative service shop performs the following services (all the services below are assigned a value):

Oil Change
Lube Job
Transmision flush inspection
Muffler replacement and
Tire rotation

Create an application that displays the total for a customer's visit. This is my code so far:

[Code]...

## How To Solve An Equation That Is A String

Feb 9, 2011

I have an equation in the form of a string:

[code].....

## Command Prompt Text To Textbox?

May 17, 2010

I would like to capture the command prompt text and place it into a textbox.

Process.start("C:cmd.exe","arguments")

this starts the command prompt

But how does one capture the command prompt text and place it into a textbox.

From what I have learned just about anything is possible.

## Display Command Results In A Textbox?

Jun 6, 2011

I am working on a simple program called "Who's Connected?" where it runs a command (netstat -aon) and then displays the results in a multi-lined textbox. However, when I press the button that will run the command, it tells me that it can't convert the string to an integer or something. And when I did manage to get it to convert to an integer, it really showed an integer in the textbox instead of the connections and IP addresses. What do I do? Here is the code I have: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 'Running command and displaying results in textbox1 TextBox1.Text = CStr(Shell("netstat -aon"))'Results end up being a triple or quadruple digit number End Sub

## Log To Textbox From Command Line Application?

Jun 12, 2010

I want to log lines written from a command line program (unrar.exe) to a multiline textbox.

## Refresh The Textbox/datatable To Re-run This Command?

Nov 6, 2011

This piece of code grabs a customers hire record using their hire ID and displays their details in multiple textboxes. It all works fine and well, however, I can only run it once. If I type in another customers hire record ID it just displays the first customers details that were materialised, which I assume is because the datatable has been populated and not refreshed based on the new hire record ID I've entered.

[Code]...

With this I can search a column of a datagridview for a match. It works all fine and well, until I insert a new record into the database at which point I refresh the datagridview to display the newly added record. After I do this, I can no longer search using the textbox. Once again, I'm not quite sure what to do to fix this issue.

## .net - Solve The Performance Decay Of A .NET 1.1 Application?

May 20, 2010

I have single-thread windows form application written with VB.NET and targeting Framework 1.1. The software communicates with external boards through a serial interface, and it mainly consist of a state machine that run some tests, driven in a loop done with a Timer and an Interval of 50ms. The feedback on the user interface is done through some custom events raised during the tests.

The problem that is driving me crazy is that the performance slightly decrease over time, and in particular after 1200/1300 test operations. The memory occupied does not increase over time, it is only the CPU that seems interested by this problem. The strange thing is that, targeting framework 2.0 and using the same identical code, I do not have this problem.

I know that is difficult without looking at the code, but do you have suggestions how can I approach the problem? EDIT: I am really lost, after a couple of intensive work the application starts slowing down. The selected row is related to its process, if it could help.

EDIT2: Using the Windows Task Manager I detected that the Handles counter is increased by 1 at the end of each operation. I don't know if it is the cause but the application starts to slow down when the handles counter reaches about 1500 handles. I checked that all necessary RemoveHandler are called after each operation. Any idea?

EDIT3: I found that the handles problem is generated by the C++ library we are using to communicated with the serial device. It then happens both in .NET 1.1 and .NET 2.0. The difference, and that's strange, is that if the target .NET 1.1 the application slow down/freeze instead for .NET 2.0 I reached more than 30000 handles without loosing performances. Now I don't know if the problem is really caused by this lost handles, I will try to ask to the developers of C++ library to correct the problem and see if it solves the problem I am having on .NET 1.1.

## .net - Using Regex OR Operator To Solve 2 Conditions?

Apr 10, 2012

I am trying to combine 2 regular expressions into 1 with the OR operator: |

I have one that checks for match of a letter followed by 8 digits:

Regex.IsMatch(s, "^[A-Z]d{8}\$")

I have another that checks for simply 9 digits:

Regex.IsMatch(s, "^d{9}\$")

[Code]...

Apparently I am not combining the two correctly and apparently I am horrible at regular expressions.And for those wondering, I did take a glance at How to combine 2 conditions and more in regex and I am still scratching my head.

## How To Solve Date Format / When Using Window XP In C

Jun 2, 2011

I am using window 7, when I run my code in local everything is alright, but when upload to window server 2003 the code will coming error "String was not recognized as a valid DateTime".My computer setting (date format) all same with my window server.[code]

## How To Solve Duplicate Of Data After Search

Apr 6, 2011

In first search, result will show.In second search, the result in first searching will also show with the result in second searching. [code]

## Time Out Error - Solve It Rather Than Optimizing?

Apr 8, 2010

I have a lengthy query..always it shows timeout..I am filling it in a dataset, not using command execute.Is there anyway to solve this rather than optimizing the code? any way to solve the timeout..

## Dos Command Execution Logs Show In TextBox?

Dec 23, 2011

Private Sub Button14_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button14.Click Shell("dataiphuc -a com.apple.afc2 -s data/scriptn1") Its a DOS Command End Sub

Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged

When A Button click a Dos Command Execute..So How I can Do execute A dos Command log Show in Textbox1..

## Link A Textbox To A Cmd Command In Visual Basics

Jul 20, 2010

I want to make a program that will sync two folders together with the command in cmd called xcopy, so when i click on a sync logo the folders sync. But i want the user to be able to browse for the locations then set the locations as they sync folders. I already have linked two FolderBrowserDialogs to two textboxes so when i select a folder in the browser the directory shows in the text box. But then how do i put the two directories into the xcopy command? This is what i have done so far...

[Code]....

## MySQL A Command Simillar To Textbox.AppentText?

Oct 28, 2009

How can i just add a string in a field? its text = "AAAA"and i want to add ";BBBB"How?the result should be text = "AAAA;BBBB"

## Run A Dos Command With A Button And The Output Need To Come In The Outpud Textbox?

Oct 13, 2009

I want to run a dos command with a button and the output need to come in the outpud textbox.the only problem is that i need to give another option in the dos command, how can i do this?This is what i use. but how can i give the second command in that command that is already running?

Private Sub CMDAutomate2()
Dim myprocess As New Process
Dim StartInfo As New System.Diagnostics.ProcessStartInfo
StartInfo.FileName = "cmd" 'starts cmd window

[code].....

## Making A Program To Solve Second Grage Equation

Jul 1, 2012

So im making a program to solve second grage equations,its already working but i want to make it better,heres my idea.Right now the user must input the three equation coefficients (in a equation like 2x+2x+2 they are 2,2 and 2),i want to make it possible for them just to insert the equation like 2x+2x+2 and the computer will get that data,and extract the coefficients from it. [code]

## How To Solve "Operator '=' Is Not Defined For Types

May 22, 2012

I get an Operator not defined error at "SetAttr(j = fo.GetFolder("C:\Documents and Settings\a19238\My Documents\VB Grille OrderTest\"))"

[code]...

## Running A DOS Command And Show Output In Textbox Realtime?

May 25, 2010

I want to run some dos commands (eg: a ROBOCOPY) and show the output from this realtime in a text window to show the user something is happening.The command may take a number of minutes so it's important the output is showing in the VB application realtime, and not just all at the end. Obviously the user will wonder what is happening during this time.

## Sql Server - User Input Textbox To Be Used Within A SQL Script Command

Feb 16, 2011

I am trying to create a vb.net program that will ask a user to input a beginning date and ending date within two textboxes. I want to use these dates that they inputed in a stored procedure that I created to run a query that will return results based on those dates.

Here is my current SQL Script.

SET NOCOUNT ON
DECLARE @DBNAME NVARCHAR(MAX)
DECLARE @DBNAME1 NVARCHAR(MAX)

[Code].....