The code performs correctly when the input is an integer, but when I enter a character, the result is as though I've entered an integer. Can you tell me what's wrong with my TryParse statement?
Private Sub btnCompare_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompare.Click
' Declare Local Variables
[CODE]...
My understanding of the Integer.TryParse() function was that it tried to parse an integer from the passed in string and if the parse failed the result integer would remain as it did before.
I have an integer with a default value of -1 which I would like to remain at -1 if the parse fails. However the Integer.TryParse() function on failing to parse is changing this default value to zero.
Dim defaultValue As Integer = -1
Dim parseSuccess As Boolean = Integer.TryParse("", defaultValue)
Debug.Print("defaultValue {0}", defaultValue)
Debug.Print("parseSuccess {0}", parseSuccess)
[Code]....
Is there any way to use the TryParse method to check for letter text input?For example, a user needs to input a name in a text box. Is there anyway to check that input are all letters?
View 4 Repliesthis is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code. This is what I have for the calculate click event:
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this is for homework but I have 90% of the project done, I just need to finish the data validation portion of the code.This is what I have for the calculate click event:
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
Dim intInputA As Integer
Dim intInputB As Integer
Dim intInputC As Integer
[code]....
My Problem: I am using the Try parse to validate weather the inputA(B)(​C) is an integer or not, if it is an integer, i want it to move to the nested if and validate that it is a positive number, and show the error message in the label if it is not. If it is not a number at all i want it to show another message in the label. The problem that I am getting is that even if i put in a letter for the input it does not catch it and it continues on to the select case, which comes out 0.
I am writing a hangman type game and I am displaying the word to the user in a label as all *'s, but I cannot figure out how to have just one of the *'s changed in the label to the correct letter when the user inputs the correct letter into the text box and clicks the check letter button.Everything else in the program works perfectly, except for this part.[code]When I use the .Replace it changes all of the *'s to the correct selected letter.
View 2 RepliesI have a LINQ2Entity problem, I want to get the value, string, from a database, so I select FProducts.Serial_number, and to end the query, I do .ToDictionary. The problem is, it tells me that it doesn't have sufficient parameters, to convert ToDictionary. So I need something like select FProducts.Serial_number, Nothing). ToDictionary. Also FProducts.Serial_number, 0).ToDictionary doesn't work.
Sub GetStatistics(ByVal ProductNumbers As List(Of String), ByRef Passed As Integer, ByRef FailedProducts As List(Of String))
Passed = 0
FailedProducts = Nothing
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I'm connection to a sql server 2005 database. I have a field called MapName which contains the following name for example:
SAMWON TEXTILE CO LTD
NO NOT USE
Notice the field contains an enter character.Now in my vb code I have the following
Dim SupplierCommand As New SqlCommand("SELECT OurID FROM [Mapping] WHERE (MapName=@SupplierName) AND (OrgId=" & CustomerId & ") AND (Active=1);", con)
SupplierCommand.Parameters.AddWithValue("@SupplierName", f_supplier)
'con.Open()
[code]....
where the @SupplierName parameter would be:
SAMWON TEXTILE CO LTD
NO NOT USE
exactly the same as my database field.But for some reason this query fails because of the enter characters.
I'm connection to a sql server 2005 database. I have a field called MapName which contains the following name for example:SAMWON TEXTILE CO LTDNO NOT USENotice the field contains an enter character.Now in my vb code I have the following
Dim SupplierCommand As New SqlCommand("SELECT OurID FROM [Mapping] WHERE (MapName=@SupplierName) AND (OrgId=" & CustomerId & ") AND (Active=1);", con)
SupplierCommand.Parameters.AddWithValue("@SupplierName", f_supplier)
[code].....
i need to alter the code to determine if an integer entered by a user is prime preferably to determine if the number entered (between 1 and 50 is even or odd and prime from 51 to 100) i have the code for listing primes from 51-100 (or whatever range needed)but can i condense the code to a smaller foot print rather than have three different sections for each request
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I have Tried to convert "1" to integer using Tryparse it showed true but when I used it on "1.00" it is showing it as false, why?
View 1 RepliesI have designed a form with textboxes for numerical entry. I need to validate each textbox so the number entered is an integer, and is between 0-1000. I am struggling to find how to validate the data entry.
View 4 RepliesInside a multiline Text Box I want it so that when a user presses Ctrl AND Enter then a new line is entered. But, if they press Enter on it's own, then it acts like the Accept button on the Form. I believe this is how Facebook does it.
Ctrl+Enter=NewLine Enter=Accept
I have over 4,000 xml files that needs to be converted in to a character based on a value and entered in to a rich text box. It will do this, until it runs out of files to read. I have tried "try" statements, "if" statements...
Imports System.Xml
Imports System.IO
Imports System[code]........
I've been pulling my hair out on this one.can any of you tell me how to put a msgbox on screen whenever the apostrof ( ' ) character is beeing entered in a textbox?
View 3 RepliesI've written up the following code (please note i only started to learn VB yesterday)
CODE:
And what I want it to do is when a letter, or character, is entered, i want to have Label1 display "invalid" but i cant seem to figure out how...
I would expect the following vb.net function to return a value of Nothing, but instead its returning a value of 0.
[Code]...
Is it possible to add a tab character into a textblock? It's a textblock in Xaml, but i'm adding the text in code, so it has to be done there. Is there any action like "Environment.NewLine", but for the "Tab" character?
View 2 RepliesI want to take each character in a string and multiply it by 7 then 3 then 1. And then loop back to 7 etc. This is what I got but it doesn't work
For Each ch As Char In row("SCAN2").ToString
product = Convert.ToInt64(ch) * 7
Next
Lets say the first character is 8. It should be 8 * 7 = 56
but I get 392.
I am having a problem writing a string like a word "Zürich" the output became "Z�rich"
I am using StreamReader and StreamWriter.
Code: below
Imports System
Imports System.IO
Imports System.Text
Module Module1
[CODE]...
We have a multi-line control that we are attempting to prevent the Enter/Return key from being used to create a new line.Strangely enough, "AcceptsReturn" as False does not prevent this.So we added the following:
Private Sub txtAddr_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtAddr.KeyPress
If e.KeyChar = Microsoft.VisualBasic.ChrW(13) Then
e.Handled = True
End If
End Sub
This works fine, however one of the QA people discovered hitting Control + Enter still puts in a newline.How would we prevent this?And why does AcceptsReturn being False not work as it appears it should? What is the intended purpose of it?
I have a large number of methods and I need to call one of them, based on some integer. Of course I could just use a Select Case statement like so
[Code]...
My friend and I are taking a visual basic online class. We are total beginners and are having trouble with a programming assignment. We have to create a arithmetic calculator with an enter button multiplication button and an addition button. What we can't seem to code properly is the event handler that allows us to use the enter button when we type in an integer in the textbox. This assignment is detrimental to our grade!
View 6 RepliesIn my datagriedview i have 5 column called T,C,F,S and H.I want to specify in column C that the user must enter 3 digit. For column H the maximun value should be 2000 so user should not enter more than 2000.how i can specify this condition for my datagriedview column?
View 2 RepliesI have been struggling with getting FormViews to work the way Microsoft expects me to for about a day and have figure a bunch of great stuff out.
I can catch e.Exception and e.ReturnValue in the ObjectDataSource.Inserting Event Handler and I can even cheat and check other properties of the Object in the ObjectDataSource.ObjectDisposing by checking the e.ObjectInstance ... and I even learned that FormView's Inserting Handler Runs AFTER the ObjectDisposing Handler so If there is a problem found I still have time to react to it and st the e.KeepInInsertMode to true on the FormView.
My problem is, it seems that the values entered by the user into the Insert form are cleared regardless.
So, How do I Prevent a FormView from clearing after it's Insert Method has fired?
(Using ASP.NET + VB)
I don't think posting my code here will really do much good and i would have to modify it to trim out confidential business logic stuff... so I'll skip it for now.
edit:
I have found a temporary and admittedly terribly cludgy solution (in case no one ever finds a REAL solution to the problem).
I have a page variable defined as:
Dim eInsertArgs As FormViewInsertedEventArgs
And then I do the following in my ItemInserted handler
If boolInsertErrorOccurred = False Then
e.KeepInInsertMode = True
eInsertArgs = e
[Code].....
The effect of this is that I am setting the values BACK to the submitted values AFTER ASP.NET binds the FormView to the default (blank) Template.
I would like to make an application whereby the user can select a color, enter a character into a textbox, select another color, enter another character and so on and so on...This multi colored text that has been entered into the textbox by the user must then be shown on a label. I cant get the damn characters in the label different colors They are all for example, either red or all blue.
View 2 Repliescould anyone please help me with this1.Create a simple Times Table program which will allow the user to enter an integer value n (between 1 and 20) into a textbox. On the click of a button output to a label the n times tables. Use a For Next loop to perform the repetition.i can output them to a list box but only last one to a label ive been stuck for 3 days.
View 8 RepliesHaveing troubles with an assignment. I am writting code that will allow user to enter a score and the program returns a grade based on the score entered. I can get it to work using "IF" statements but want to use code for ranges. My "IF" code is as follows.......
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Haveing troubles with an assignment. I am writting code that will allow user to enter a score and the program returns a grade based on the score entered. I can get it to work using "IF" statements but want to use code for ranges. My "IF" code is as follows.......
[Code]....
OK, every time the letter a is entered into a textbox, I want it to enter in as a 1 instead. Help?
View 3 Replies