I'm making a calculator that would read a "string" from a textbox and parse it and follow Order-of-Operations/PEMDAS on the string. I have a couple of questions:
1) What would be the best way to parse the code so that it won't just take a "left expression" and "expression" and perform the operation on those 2.
2)How would I be able to make is so that 0 is considered valid, but prevent a 00 or 020 or 002 to be inputed.
I am creating a page with an area name and an input box next to it, code below:
Dim SQLConnection As New Data.SqlClient.SqlConnection(System.Configuration.ConfigurationManager.AppSettings("sqlstr"))
Dim cmd As New SqlCommand
Dim LoadAreaReader As SqlDataReader
cmd.CommandText = "ListAreas"
[code]....
This works great, the problem I am having now it retreiving the details once Button1 is clicked. I got as far as this:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
For Each key As String In Request.Form.AllKeys
If key.Contains("txtPrompt-") Then
[code]....
But just need to display the id of the input box that has a value of more than 0. Am I close at all?
ant to ask you if anyone knows a way to read Dynamic disk status (like rebuilding) true WMI
View 1 RepliesI have calulator while pressing the calculator buttons that corrsponding caption will display in text box
ex:(12 + 2+ (text1) - sum1+[Ref1]/[ref2])
1. how to remove [i have button for remove] string upto previous oprator
2. ex now if i cliked the remove button ex :(12 + 2+ (text1) - sum1+[Ref1]/ should be like this
3. again i clicked it should be like this ex :(12 + 2+ (text1) - sum1+
How can I check the 'Checked' property of a dynamically-created checkbox during the Page_Load subroutine? Basically, I have a VB.NET page that creates some table rows dynamically, based on a number selected by the user. So, for example, if the user selects "3" from a dropdown list, the page posts back and creates three table rows. Each row contains a couple of textboxes, a dropdown list, and a checkbox (which are all .NET form controls rather than plain HTML controls, I should point out).Typically, the user would enter a few details into the form controls, and click the 'Submit' button, after which the page iterates through each row, and inserts the data into a SQL Server table.But if the user ticks the checkbox for that row, this signifies that the page is to ignore that row, and NOT insert that row of data into the database when the user clicks 'Submit'. This works well, but there is a problem. If the user clicks 'Submit' and some of the values entered into the form controls are invalid (so, for example, the user didn't enter their name) then the page won't submit the data, and instead, shows an error to the user informing them of the values they need to change. But if the user creates three rows, for example, but decides to "ignore" the third row (by ticking the checkbox) then when the page posts back, finds some invalid entries, and re-shows the form to the user to allow them to correct any errors, I'd rather the page didn't render the third row altogether. After all, they chose to create three rows originally, but then decided that they only needed two. So it makes sense that the third row is not recreated.
But what seemed to happen was that objCheckbox.Checked was always returning False, even when the checkbox was ticked. Once the page had loaded, the table rows had rendered again, and the tick was present in the checkbox, so it's not like the value was lost on postback. But at the point I check whether the checkbox is ticked, it always returns False, rendering a table row that the user doesn't need.Does anyone know how to get round this problem? I've read lots of articles about the .NET ViewState, and the page lifecycle, but I've yet to find a solution that works. I simply need to be able to check if a checkbox is ticked before re-creating some dynamic controls. [code] But then I basically found out that you can't override a protected member with a public one.
The object of this project is to create code for a 4 function calculator that takes a character string like: 5 + 123 + 6 = and generates a new string: 134 There are multiple tasks to be done. First the string must be broken into tokens; in this case, there are 6 tokens:
5, +, 123, +, 6, and =
Dim input As String = (txtIn.Text)
Dim x() As String = input ?????
[Code]....
GPA 1.0, 1.1, 1.2 through 4.0 alredy entered in a listbox in propertiesradFemale, radMale, btnCalc btnExit: lblMale, lblFemale, lblAll to store averages. There are no text boxes.Please look at my code and tell me what I'm missing.... I'm sure it has something to do with the listbox...
Option Explicit On
Option Strict On
Option Infer Off
[code]....
Say I have a string LineOfText = "UserName1 Password1 UserName2 Password2" how would I just grab the last word (Password2)
View 4 RepliesIt's just a small calculator project so it's no big deal, but after I had built the project, I wanted to change the project name and all the file names that had that string in it (and all internal references to that string). I had played with this before and knew that it was asking for trouble but I thought, "What the hell, I'll try it again." feeling a bit brash.
Well, everything works fine in debug mode, but there is this DOS window that pops up just before the main form does, and it doesn't go away for the entire debugging session. I think I see that window pop up on all other projects too (if the main form doesn't cover it up completely), but normally, it's only there for a split second.
I've always been slightly stumped as to why the following happens if I write[code]...
View 4 Replieshow do i give a string a dynamic name i.e. in the below for loop i want to create a string name using the item in question.
For i = 1 To NumNames
Dim userName & i.tostring As String
....
Next
Im currently working on a project to build an application for Windows Mobile 6.I have a SQL query string:
Dim connectionString2 As String = "Data source = " + path + "HC.sdf"
Dim cmdText2 = "SELECT * FROM BigC_Rangsit_0_"
I want to substitute the table name ie. BigC_Rangsit_0_ with a variable which contains the table name.say, during runtime the user selects a table from the dropdown list , that variable should be substituted with the selected table name dynamically in the SELECT statement.
Dim cmdText2 = "SELECT * FROM "selected table name VARiable""
well, I need the right syntax for this.
Imports System.Data.Sql
Imports System.Data.SqlClient
Imports System.Configuration
Module Module1
[code].....
this is my connection string on my pc how can i make this as a dynamic connectionstring so i cant remove the db and get a new connectionstring?
I am trying to create a dynamic string statement[code]...
View 7 RepliesI'm working on a project where I need to evaluate some formulas in VB.NET. I've been using the MS Script Control to evaluate some of the simple logical/mathematical formulasHowever, I'm now faced with dealing with string expressions that set variables in my program to certain values. So, for example, let's say I've got the following:
Dim netPrice As Decimal
Dim expressionFormula As String = "netPrice = 0"
[code]....
I have an array filled with values from Excel cells. Each of the values is a concatenation of two things separated by a pipe, like "Machines|MachinesCode"
I need to, as I fill this array, strip out the pipe and everything in front of it so that the array being filled is only filled with the "MachinesCode" part of the cell value, but I haven't had much luck finding how I should do this. Each cell is dynamically filled and will never have a set length, so I can't set a trip by a particular number value of characters in the strings.
This subroutine is what I'm using. I am filling array FieldArray with another array (ExcelArray) currently holding the concatenated values.
Public Shared Sub PopulateFieldArray(ByRef FieldArray() As String, ByVal iFieldCount As Integer, ByVal ExcelArray(,) As Object)
Dim iIndex As Integer
For iIndex = 1 To iFieldCount
FieldArray(iIndex) = CStr(ExcelArray(2, iIndex))
Next
End Sub
But I don't know what to wrap around the CStr Excel array to cut off the pipe and all values before it while I fill FieldArray.
How to make Dynamic Connection string for VB.Net 2008 & Sql Server 2005 database
View 1 RepliesCan we execute any string like "Button1.Text = Value"
Question arises from sql server where we can store a dynamic/static query in a string (varchar) and execute it and it will put the value to the button1.
I am trying to send a query to a device over http with the url:
[code...]
What I want to do is retreive this xml file over http and save it with my VB.NET application. To do
that I am trying the following function, and it works to retreive the page source for normal web
sites, but it fails when trying to retreive this particular page.
[code...]
I think that the problem is that the code is counting own a present length in the header, which is
not the case for a dynamically created page. (i.e. you dont know the length until you are done) As
such, the code should be written to read the entire reply.
I'm not sure if i titled this question properly or am asking it properly, but here goes.I've got serialized objects (in XML) stored in a database, along with a string/varchar indicating the type.
[Code]...
I am creating a windows application which required Dynamic Connection String in the app starting (user need to provide db credentials through a form), After entering the connection credentials user redirected to new win form Everything is working fine but how can I pass my dynamic connection to another form.I tried to save it to App variable but I couldn't (I think its read only) Also I tried save it to registry but can't retrieve values.Is there any other option available ? like writing & retrieving ConString to a text file or XML.
View 1 RepliesIn a nutshell, I am selecting values from a checked box column in a grid view. After checking the boxes I have a function that concatenates each customer number into a string called @CusList to use a parameter for a stored procedure Public Function SelectCusList()
Dim CusShow As String
Dim CusStr As String
Dim CusList As String
CusStr = ""
[Code]...
I am currently making a server monitoring application that pings the server to check its uplink, so far it creates all the picture boxes and labels for each server, and then pings the server, although I have a picture that I want to change dependant on the result.
Below is the code I am currently using, the problem occurs with the objectname variable which allows dynamic coding, where i get a error, saying that "Public member 'image' on type 'String' not found".
Private Sub Ping()
Dim i As Integer
Dim objectName As System.Object
For i = 1 To count - 1
[code].....
I'm making a program that can read a game music file and able to add some texts after it.So far, this is my code:
For Each foundFile As String In My.Computer.FileSystem.GetFiles("E:O2ChinaMusic", _
FileIO.SearchOption.SearchTopLevelOnly, "*.ojn")
Dim fileName As String = IO.Path.GetFileNameWithoutExtension(foundFile) 'Filename[code]....
My problem is for example, the game music file's title is "Puberty", as you can see, my code is:
StrItm(1) = title & " INPUT TEXT HERE"
but the only one that appear is the word "Puberty" AND NOT "Puberty INPUT TEXT HERE".
I done this:
sTxt = File.ReadAllText("C:someWebPage.html")
I'm in the process of creating a tile based game. This game requires a method to load a text file and write the numbers between the delimiter "-", to a multidimensional array. However, an error message "object not set to an instance occurs. [code]...
View 4 RepliesFor starters I'm using VB 2008 express edition.I have code that writes a string out of a serial port.My issue is that the machine sends data back and I don't know how to catch it.This is my latest attempt at creating an array of characters to create a string later but doesn't work.[code]
View 2 Repliesi have a number in this format: 123 and I want a select statement such as below for comparsion so i dont have as many if statements:
Select case numbers(i)
case is = "123"
case is = "234"
example but in real scenario numbers are random.
Heres my code in which all select cases dont get fired:
Public Function UserAdd() As String
On Error GoTo Errorhandler
Dim personcount As Integer
[Code]....
But the case is statements above dont fire when I know that number is correct above
This code should read the string "34,56,23,74,69" from a process's memory addresses (in this case notepad), right now it works but very slow and I think it even breaks somewhere. My problem is with the ReadProcessMemory function. I can't make it read an entire mbi.RegionSize into the buffer. I tried everything and now, it only reads 1 byte at a time until the mbi.RegionSize is finished then it checks if the text that was read contains the text I need to be found, then it goes to the next mbi.RegionSize. Now, even with notepad which is very small it still takes 10 seconds to find something and I intend to use it with a much bigger program, so it will take like forever. Another problem is that it only finds the string "34". If I put "34,5" it won't work.
Imports VB = Microsoft.VisualBasic
Imports System.Runtime.InteropServices
Imports System.Security.Permissions
Public Class Form1
Inherits System.Windows.Forms.Form
[Code] .....
I do not have much experience with VB.What I need to do is to read a serialport as a hexadecimal string.I've done this with the MSCommlib, but now want to convert to system.io.ports.The equipment wich is connected to the serialport is a RFID card-reader, so the application haft to detect when it is receveing data, and then continue on.[code]
View 5 Replies