Vb 08 Express Case Statement - Take User Input, Validate To Ensure There's No Negative Numbers

Apr 9, 2011

CODE:

I need to take user input, validate to ensure there's no negative numbers and display monthly fee and check fee in a Label.....with a calculate button_Click

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User To Input Created Select Case Statement?

Apr 18, 2012

I just started in VB, I have created select...case statement to do some input validation.

Everything apart from the works. Its an extended ASCII character, can this be the cause?

[Code]...

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Case Statement - Convert Numbers To Roman Numerals?

Mar 10, 2009

I wrote a program to convert numbers to roman numerals but something in my code is making every number I put in return a ""I" roman numeral. Here's my code.

[Code]....

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Validate User Input In A New Class?

Apr 15, 2012

I am trying to create a new class to validate user input and then call that class from my main form. I am not looking for anything to do the work for me, as this is the last part of my project but I am looking for a place to start. I tried the isNumeric IF statement but I have to create an object to reference the specific text box. Can I be generic and say that aTextBox requires validation and then call that class?

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User To Input Numbers From An Inputbox And It Displays The Total Numbers Entered?

Mar 18, 2011

I have a program that allows a user to input numbers from an inputbox and it displays the Total numbers entered, the sum of the numbers entered, and the average of the numbers entered. What I can not seem to find it how to have it display the largest number entered. The code I have so far is,

[Code]...

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Validate User Input Before Opening Up The Next Form Page

Oct 23, 2010

I am making a windows application that should validate user input before opening up the next form page. I can get the error messages to show, but after correcting the error, they won't disappear and open up the form.

[Code]...

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Validate User Input - Loop Conditional Statements To Indicate Errors?

Mar 20, 2011

I have several text boxes I need to validate. I am not understanding how to validate in Visual Basic 2008. So I deployed standard If Statements to handle bad data. I am having two problems.

Lets say the user entered wrong data, example, numbers; an error message is displayed. The text boxes cannot contain numbers, be left empty or contained characters, like !@#$. The problem is if the user enter text, and then entered a wrong data again the code does not work or display error message. How can I make the conditions so that they throw out error message even if the user had previously entered good data.

Another example: If the user enter good data in text box 1 and bad data in text box 2, the error message does not work.

Finally, how do I filter out characters to allow only text. Is there a way to use this code on multiple text boxes with out writing the entire code for each form control?

Here are the conditional statements.
Private Sub btnDataSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnDataSubmit.Click
If IsNumeric(txtDataEntry.Text) Then
lblErrorDisplay.Text = "Invalid Name!"
lblErrorDisplay.BackColor = Color.Red
[Code] .....

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User Input 10 Inclusive Numbers Between 100 And 199?

Jul 27, 2009

I have been trying to have a user input 10 Inclusive numbers between 100 and 199, but it doesn�t seem to be working, can someone point out where or what am I doing wrong?

[Code]...

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VS 2008 How Many Numbers User Input

Mar 18, 2010

I have an assignment that is supposed to accept user input of random numbers. The only part I'm struggling with is I'm supposed to make copies of the array after the user is done inputting the numbers. These copies has to be sized exactly to how many numbers the user input. Am I supposed to use a counting variable and if so how?

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Display All Even And Odd Integers Between 2 User Input Numbers?

Mar 23, 2009

using for...next loop the program is supposed to accept 2 user inputed integers and display all even numbers between the two in one label and all odd numbers between in another label.

Private Sub displayButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles displayButton.Click
' displays the odd and even numbers between two integers
Dim intNum1 As Integer

[code]....

I'm not exactly sure what this code is doing. When I put 1 in the first number and 10 in the second number, the odd label only shows 9 and the even label only shows 10. Another example is when I put 2 and 15, the odd label comes out as 15 and the even label is 14. I'm very new to VB and programming in general and have just started getting into for...next loops and don't fully understand what the counter is or how the loop is supposed to work. I guess I'm having 2 problems. One is that I don't know how to make the program find the right numbers(my logic is off? or how I set up the loop isn't right?) and the other is the labels are showing only 1 number each instead of all the numbers in between on their own line.

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Make A Program That Will Take 2 Numbers Input By The User?

Jan 21, 2010

I am new to VB.Net and programming all together. I am trying to make a program that will take 2 numbers input by the user, Add them together and display the sum. Then take the sum and divide it individually by each number to give you what percent of the sum the numbers are. I'm working on making it a program that will calculate the Hardy-Weinberg equilibrium for my Anthro Class. I'm just doing this for practice for my VB.Net Class. But i will move onto that at a later time. I just want to finish this first.

So.. Here is my code so far. It's not complete yet but this is should be enough to make it function.

[Code]...

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Use Upper-case And Lower-case Letters As Well As Numbers?

Oct 27, 2010

Im using a Random Pool number generator and was wondering how i can make it use upper-case and lower-case letters as well as numbers here is a pic

[Code]...

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Using Sender As A Case In Select Case Statement?

Mar 21, 2006

When my form loads it adds some handles (using AddHandler) to a sub (showStatus). What this sub does is checks which control activated the sub (using sender.Equals) and displays text in the status label (status) accordingly.For this I use an If...Then statement for each possibility. There are many possibilities and my code get cluttered. Is there a way to do the same thing with a Select...Case statement. I tried: Select Case sender Case tbOne : status.Text = "blahblahblahblahblahblah" End Selectwhere: tbOne is a textbox, status is a StatusLabelIt gives me an error though, saying "Operator '=' is not defined for types 'Object' and 'System.Windows.Forms.TextBox'."Any ideas on how I can get this to work with a select case statement?

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Standard Deviation Calculator - Random Number Of Numbers Input By User

Feb 19, 2011

Im working on writing a program for doing standard deviation and as of right now im running into one slight issue with subtracting my mean from the original numbers. I will post most of my code so you can get an over view but i mostly just want help on this one little part for now. Im going to be making a website for school and put some programming stuff on it so i wanted to make just some random programs for it so this is school related but not really homework. It's line 26 and 27 that this is relating to. When i put a stop in my code and look at the result of arrayDifferences it gives me 0.0 when it should be -1. I know i can go this route and say arrayDifferences(1) = arrayDifferences(1) - arrayAvg but seeing as how i want this to be a random number of numbers input by the user i cant do that.

CODE:

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Case Statement Inside A Case Statement

Oct 31, 2011

I have coded a case statement that changes the background colour of a panel. [code]When the code is run, it works for the case of colour1 that is NOT 1 or 2. However, when the colour1 is 1 or 2, it is supposed to pick a number from set array and run another case statement. Instead, it only picks the last value (for 1, this is 5, and for 2, this is 7).

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Write A Program To Request Positive Numbers One At A Time From The User In An Input Dialog Box

May 12, 2009

I'm currently in VB class at my highschool and we just got chapter 6.1 to read on this online textbook that we follow. Anyway, we are doing loops now and the problem reads "Write a program to request positive numbers one at a time from the user in an input dialog box. The user should be instructed to enter -1 after all the positive numbers have been supplied. At that time, the program should display the sum of the numbers." So far I know this much

[Code]...

Now I know this isn't right But I can't find out how I'd pull out the numbers the user entered to get the sum of them and not include -1 because as it stands, when I hit ENTER with -1 the label just shows -1.

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Validate Html.editorfor - Validate The User Data Entered

Apr 26, 2012

I'm trying to figure out a way to validate the user data entered:

[Code]...

This is in MVC3, VB.net. I'm looking for an easy way to validate a users input data into the editorfor field.

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Read Upper And Lower Case Letters Without Having To Put The Upper Case Letters In Select Case Statement

Oct 28, 2009

i have a program using a select case to convert letters to special charaters. My question is how can I get the code to read upper and lower case letters without having to put the upper case letters in my select case statement. Example: Part of my code is

[Code]...

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Ensure Textbox All Fields Populated With Text And / Or Numbers

Apr 17, 2010

I have a form (formA) which contains a tabcontrol with two tab pages. Each tabpage has 6 textboxes and 3 comboboxes. In addition to the tabcontrol there is a separate combobox and textbox. The question I have, is how to best ensure that all these fields are populated with text and or numbers? From this a start button is pressed which generates another form (formB) which requires the fields from (formA). If for instance 1 or more fields is not populated, then generate a message to show the user which 'box' requires data. Only when all fields are populated will this enable the 'start' button.

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Validate The Content Of Two Textboxes (maskedtextboxes) To Ensure The Content Is The Same?

Nov 25, 2010

1)This is my code.. (below)what i am trying to do here is to insert username and confirmed password into a sql table called login via a pre created form.I have 1 textbox, 2 Maskedtextboxes and a button.

what i would like is if the passwords do not match in both maskedtextboxes for the system to throw out a message saying passwords do not match please try again..which then clears previous content and requires the user to enter details again. once details are correct and system commits the new user details to the table and throws up a confirmation message.

[Code]...

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Show - Instead Of () For Negative Numbers?

May 10, 2011

What do I use for the format number function to show a - for negative numbers instead of ()?

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ElseIf Statement Into A Select Case Statement?

Jun 23, 2010

A co-worker wants to convert the following IfThenElseIf statement into a Select Case statement.
Explain why this is not possible.

If temperature = 100 Then
X = 0
ElseIf population > 1000 Then
X = 1
ElseIf rate < .1 Then
X = -1
End If

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.net - If Case Statement Throws Exception "case Else" Start Working?

Jun 19, 2012

It looks like impossible but...

Try
Select Case command
Case 1
smth()
Case 2

[code]....

Firstly Case 2 runs. Throws exception. And right after this debugger shows that next processed statement is Case Else. Only after Case Else throws own exception Catch block start working. I've never seen this trick. Why can this happened?I'm sure the block is entered once (not like this:first enter hit Case 2 and second hit Case Else).

Update:-To Matt Wilko. Thank you for answering. I've switch to Strict On in Options of VS2010 but nothing has changed. Command is variable, not function. Watch tool shows that on each step Command is the same ( Command = 2).

Fixed. Yeeaaaahhh. I simplefy code to
Try
Select Case 2
Case 2

[code]....

and change project to Console app. This works as I mention. The fix was in Release mode. I was debugging in Release mode. When I switch to Debug mode everything goes as it should.

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Input A Negative Or Non Numeric Data?

May 10, 2010

i have finished my code and the program works but i need setup a few error messages incase a user inputs invalid data (non numeric, and negative numbers)i keep getting both errors at the same time when i input a negative or non numeric data. My program allows a user to calculate cell phone bill

[Code]...

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VS 2010 Comparing Negative Numbers

Jan 22, 2012

I have this

[Code]...

All that is happening above is two players are being compared by scores and a winner is then decided. The calculation works fine and places the winner in the correct spot (txtWinner1.Text) as long as the numbers are positive. So if txtU1D.Text has 13 and txtU2D.Text has 14...txtU2 is the winner. Works with no problems. However, if txtU1 has -1 and txtU2 has -2...it says txtU2 is the winner. The negative scores are common in the game being played so the situation often happens, but may be one player only. It seems to work if one is positive and one is negative, but if both are negative it thinks the higher negative number is the winner for some reason. So it will give the win to someone who has -9 over someone who is -4.

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.net - Format Negative Numbers In Parenthesis BUT NOT With $ Symbol?

Dec 1, 2011

I have seen all over the internet to format a NEGATIVE double value with a parenthesis WITH a $ symbol ie. currency type.

I am looking for a .NET format string, to format

12345.67 = 12,345.67
-12345.67 = (12,345.67)

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Input Validation To Prevent Negative Values?

Apr 14, 2009

I am trying to create an input validation for my program to prevent the user from entering negative values. I've been using:
If (decLabor < 0) Or (decPartss < 0) Then
MessageBox.Show("Input prices for parts and labor must be positive")

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Try-Catch Block Not Allowing Negative Numbers?

Sep 24, 2009

I have a program in which users are entering numbers into text boxes. I'm checking for proper data entry using a TRY-CATCH block. It works great and delivers an error message if the users enter anything non-numeric.

The problem is that now I need the users to enter negative values, but the TRY-CATCH is seeing the negative sign as non-numeric.

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Random Numbers To Display Both Negative And Positive Integers

Feb 28, 2012

I have written a program that generates and prints 10 random integers from -10 to 10, my problem is that I am returning both negative and positive numbers, aligned right with a pad of 2, but the negative is on the right hand side of my number instead of the left. here is my code, all work but I need to align the numbers and have the correct notation of negative.

[Code]...

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VS 2005 Read User Input Using Textbox But It Only Can Read Character And Numbers?

Jan 2, 2010

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.

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