I wanted to have a textbox that can be input in terms of numbers. Then I need to use the number user input into a certain equation. How I can do this??
Also if I want a user to input equation such as A+B into the box, but then I need to use the equation user input to find answer for certain A and B value. Can this be done?
I know how to read input numbers, but when I input equation like A+B, I can't use the equation to add two numbers. I tried many times but failed to use the equation.
Here my
Public Class Form1
Dim Number1 As Double
Dim Number2 As Double
[CODE]....
I am trying to develop a simple math calculator that will allow the user to input the right-hand-side (RHS) of an equation into a textbox on the application and have the application evaluate the expression for a given value of x, which is also input
into the application by the user via another textbox.For example, if the user wants to evaluate the following expression,
y = 3 + 4*x + 5*x^2
then they would input into the textbox the RHS of the equation
3 + 4*x + 5*x^2
and then enter a value of x into the another textbox and click on the calculate button.I tried this:
answer = EquationTextBox.Text
but it doesn't work.
Public Class form1
Inherits System.Windows.Forms.Form
Private Sub cmdCalc_Click(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles
[CODE]..........
This is my code for solving the quadratic equation..you input an a,b and c value and it finds the roots but i dont know how to graph it.
creating code to force user at runtime to place values in textboxes. This is what I have so far. I want to be able to force the user to have to place a value in the empty textbox and change the backcolor of the textbox back to default color after a value is placed.
HTML
Public Sub Subjectvalues()
Dim SubjectValues As TextBox() = {Me.subj_ba_txt, Me.subj_bed_txt, Me.subj_dom_txt, Me.subj_gla_txt, Me.subj_levels_txt, Me.subj_lotsize_txt, Me.subj_lp_txt, Me.subj_orglp_txt}
Dim tb As TextBox
[code]....
have a web form using Asp.net 2.0 with vb.net. I have two date fields on the form but I would like to validate them before my gridview uses them as parameters. I am using a Dataset for the source of the gridview and two parameters called StartDate and EndDate.
Basically in the code I am setting the values of the fields to the current date at runtime. Also the date fields in the SQL Server table are datetime and I only want the user to have to enter the date and it would grab all records within that date range regardless of the time. When the user enters the two dates and clicks a button on the form I need it to reset the parameters to the enter dates and refresh the data.
Here is the
Partial Class DispatchRequestList
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
[code]....
I wanted to read input equation by user A+B and assign input user value to A and B to ask them to add and give answer. But I just can't get the code to work. I using VS2005 and VB.Net.[code]
View 1 Repliesi got the following equations and want to apply it in VB.net, how do I construct it in VB.net.
[code..]
I know how to read user input using textbox but it only can read character and numbers. Is it possible that I want to read user input equation?
Example:
User type A+B
User put range of A and B.
1.25<A< 3.56
2.45<B< 9.87
I failed to read the equation using textbox. Is it there are other ways that can use to read equation input A+B?I am using VS2005 and VB.Net. I really new in this programming using VB.Net.
I need some help with the input validation of my application. Attached is the code that I have written as well as a screenshot of the front end. I specifically need input validation to verify that the user selected input for cbLengthOfStay is a number between 1-10 as well as input validation to verify the user input for txtMedication, txtSurgicalCharges, txtLabFees and txtRehabilitation is a positive numerical number. Please feel free to critique my attached code. [Code]
View 2 RepliesIf my Category and Forum selection is incorrect I am sorry and feel free to move it. I'd like to have the users input in the message box that will show. For example: There is a textbox and the user puts in their name as Bob. Then the message box would be: What my main goal is, is being able to include the users input they type inside the textbox inside the message box.
View 6 RepliesI have a problem with the code, I have input the valid username and password in the form textbox to input the strings in php, but it keep displaying the messagebox that says login failed.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
MessageBox.Show("Please enter your username")
ElseIf Textbox2.Text = Nothing Then
MessageBox.Show("Please enter your password")
Else
[CODE]...
I don't really know why it keep displaying the messagebox that says it failed when I have input the valid strings in the first place.
Option Strict On Public Class Form1 Private Sub btnDistance_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDistance.Click 'The btnEnterSpeed click event accepts and displays up to ten speeds from the user'and then calculates and displays average speed
[Code]...
I cannot figure out how to incorporate the number of days into the input box then get it to loop and count the number of times the User inputs in the number of days. Then I have to incorporate it into the equation to get the total distance D = MPH * Hours. What I have right now wil not count up the number of days and locks up after I input one number and will not add anything to the listbox. Because I also have to make sure that they cant add nonnumaric values and the number of hours per day cannot exceed 20. I have put things in and taken them out but it has been 2 days and I am lost now
I'm trying to save what the user types in the vb code Dim user as Inputbox("") for example in a .txt file i can save the textbox and listbox but i cnt figure out how to save the inputbox i really need this to be saved the most.
View 7 RepliesI am creating a form for work where managers can report when they find a customer's personal information laying around on a desk (we work at a call center where agents answer calls for a wireless cell phone provider, so we take personal information security very seriously). Anyway, I am wondering if there is a way to have a text box autofill with that manager's windows username (since they will need to be logged into their own profile to use the form).
View 2 RepliesI need something tje user can type in data to such a parts QTY cost etc. There are no predefined parts list so the user can enter any part name/Number and there is no limit to amount of parts that can be entered.
Does anyone have any idea what might be useful. It was thinks of a listview bu i can't see that you can type into that. I cant use comboboxs because there are no predefined list and i know there is some way to generate text at runtime (i think) but i don't know how to do it and i would prefer a clearer approach.
I have 2 pages, one is HTML and the other is ASPX. In the HTML I am able to get input from a user and then process a return email to them.The HTML looks like this:
<input type="text" class="input" value="e-mail" id="txtEmail" name="contactEmail" onclick="SelectAll('txtEmail');" >
[code]....
I have a table in my DB that needs to be updated. Whats a good way for a user to enter these 50 or so changes and have it update the db.
View 1 RepliesMy winforms application will display 100 different names, and I will need the user to enter a number 1 through 4 next toeach name.I will then store this data.I know I can use the spreadsheet control,but is there something much simpler that I can use? Maybe an array of textboxes or a datagrid?
View 3 RepliesI am trying to have my program time out if the user lets it sit idle for an amount of time. Is there an easy way to find the last user input? I am using VB.NET.
View 4 RepliesIn my program, I need to have the user input a list of numbers separated by commas. How would I go about storing those numbers? Would I put them into an array? If so, how?
View 5 RepliesIf Not IsNumeric(textbox1.Text) Then
KeyAscii = 0
End If
I learned in MSDN and wrote those code,but it doesn't work. This code " KeyAscii = 0" it's not correct, I just want to cancel the input, for instance,if user input 1a, then "a" will be not inputted into textbox, but "1" will leave.
sample of codes that i use to insert the data in my table, it works just fine but the problem is that i cant limit my user for example from entering null values, or integers into string or strings into integer,,,,, I also ask for assistance on how to handle any errors in my system from crashing.
Dim conn As New OleDb.OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Application.StartupPath & "MOMSTEST.mdb;")
Dim Comm As New OleDb.OleDbCommand
[code]....
On my main form i need to pop up a sub form and await user input before proceeding. I am able to pop the form but not able to pause code excecution until the user input is there. Here is what i have tried:
If chk_athor_cobb_scholi.Checked = True Then
Vselect.Visible = True
While Vselect.ex2 = False
[Code].....
The problem of course is that the while loop causes a crazy infinite loop and locks the program down during excecution. How do i await the user input?
I'm having trouble using Visual Basic. It's my first time with the program that my college course is requiring I use. I'm having problems programing the script for an application. It's suppose to take the rate of a bunch of employees that are programmed into the application using an array, and multiply it by a decimal number that the user inputs into the application.
View 5 RepliesHow can I get my app. to remember the text that was enterd into a TextBox by a user?
View 3 RepliesI have followed a tutorial at url.... It is a very good tutorial but it is also a little dated. Most people who visit it praise it to high heaven so I decided it was a good place to start as an absolute beginner to programming. (I have teamed it up with Dan Mabbut Vis basic tutorial at about.com and joined DreamInCode in order to learn what I can accomplish with Visual Basic 2008 Express ). I am up to part 6 of 7 but keep going back to part 4 because there is one aspect I just cant work out.I am creating a form which logs staff in or out of work and allows staff to include a message with their ( at work /away from work ) status details on the form.The form is supposed to update a users status in a new row when they click a button. In my form the rows per user are being over-written with the updated information - it is not being written in a new row. There is a login form which precedes the staff status form - this has a little relevant code re calling the user info from the database but I think my problem is related to the insert statement in the middle of the below code.[code]
My code has changed quite a bit since the above as the form has progressed but the problem started at the stage above and has not changed with the forms progression. Every other aspect of staff update info is working well in my form - just not in a new row.I am going bald - The tutorial was written for VB2005 Express - I am using VB2008 Express though it has not made too much difference to the tutorial.
I am using Visual Basic 2008 and I have two text boxes so people can input information and I am trying to get it so it will run a code with user credentials. However the code is giving me an error saying that "Option Strict On disallows late binding."Here is my code so far:
Public Class CIBNA Private Sub OK_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OK_Button.Click
[Code]...
I am learning Visual Basic from a book and at the end of each chapter the book gives tasks to perform. The task i am currently on involves creating a simple game called "Pick up Sticks". The premise of the game is to choose a starting number of sticks at the beginning, say '55'.
[Code]....
Alright. I have a project I need to complete by 11:00 am today. I need a program that will allow a user to input a phrase into a text box. Another text box to input a letter. Then I need the program to count how many times, the letter appears in the phrase. I have everything set up. I know how to count how many characters are in the string, but not how many designated letters there is.
View 5 Replies