Creating Numeric Textbox (.Net 4.0 - Winforms)?
May 12, 2012
I'm trying to create my own numeric textbox that will handle decimal as well as whole number values. The concept is, unlike the regular textbox, this one will accept a value of 'Double' data type and show it with proper formatting e.g. Leading Digits, Digit Grouping etc. When the textbox value is called, it returns the actual 'Double' data type value. The entire thing is done through the 'Text' property; wherein the regular 'Text' property is shadowed and one with 'Double' data type is used.The problem is, in the designer properties window, the Text property always remains readonly and its value says 'Object reference not set to an instance of an object'. What's my mistake?
My code follows:
Code:
Imports System.Windows.Forms
Imports System.ComponentModel
Imports System.Runtime.InteropServices
[code]....
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May 12, 2012
I'm trying to create my own numeric textbox that will handle decimal as well as whole number values. The concept is, unlike the regular textbox, this one will accept a value of 'Double' data type and show it with proper formatting e.g. Leading Digits, Digit Grouping etc. When the textbox value is called, it returns the actual 'Double' data type value. The entire thing is done through the 'Text' property; wherein the regular 'Text' property is shadowed and one with 'Double' data type is used.
[Code]...
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Nov 18, 2009
I am trying to mkae sure that there has been 16 numeric digits entered into the masked textbox. If not show errror message and if so to call the fucnction ValidateLuhn. When calling Validate Luhn i want the program to tell me if the number entered is valid or invalid using the code in the function:
Private Function ValidateLuhn(ByVal value As String) As Boolean
Dim CheckSum As Integer = 0
Dim DoubleFlag As Boolean = (value.Length Mod 2 = 0)
[CODE]...
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Mar 24, 2010
I currently have a subroutine that generates a file with specific parameters, and it relies on user input in 2 fields. Now I also have a numericupdown control. What I'm looking for is a way that if Numericupdown.Value = 3 then it will generate 6 textboxes and once the parameters are filled out completely it will generate subroutine times(numericupdown.value) and output it to a single file.
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Apr 11, 2010
i have a media player in vb form...with 2 files in a listbox as a playlist now i want to create a fade between changing these files as a transition how can i do that...
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May 11, 2009
I have a numeric value in a Textbox that I'd like to format as a percent. How can I do this in C# or VB.NET?
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Sep 7, 2010
I have to give textbox control id like below
<asp:TextBox ID="7_1" runat="server">
It is not allowing me. If I give
<asp:TextBox ID="Test7_1" runat="server">
Then it works fine. Why? Why can not give start with numbers?
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Jun 2, 2009
How do I suppress all data except numeric?
This is not working on KeyDown():
If e.KeyData < Keys.D0 Or e.KeyData > Keys.D9 Then
e.Handled = True
End If
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Mar 9, 2009
Is any easy method to set a textbox poperty which allow only numeric value without occur any events...?like setting to textbox property?
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Jun 9, 2011
I have a function in my textbox1 with the got focus event. I have a 40 textbox in my goupbox1.[code]I want that when the textbox1 gotFocus, all my textbox in groupbox1 under the for loop event will declare that only numbers are allowed to be entered in all the textbox. I manage to work with it but only in a single textbox. Here is my code for it.[code]Is there a way or would it be posibble to put this code # 2 into the code # 1? So that I don't have to declare 40 TEXTBOX which is not good.
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Apr 23, 2012
I want all my textbox in a form to allow only alphabets,no other characters.I can do this with only one textbox at a time.Is there a way to do it for 10 textbox at a time.[code]
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Aug 31, 2010
it should take either decimal values or integers and max length is 16if it takes decimal value as input then it should contain only 14 digits in decimal place and 2 digits in fraction part eg(1234567.12-valid) but (12345678.123 - invalid) and also(123456.12345- invalid)
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Mar 5, 2012
i've created a very simple .exe file on my project in vb winForms but i don't know if i have crystal reports, Database, .swf files on my project.
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May 17, 2012
Why when I try to save a null value from textbox at sql server 0 is saved?
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Jul 21, 2011
I simply want to have a user enter a number, e.g., 3.5, into a textbox and then click a button to process it. If nothing or a char or string is entered, I want to inform them to enter the number and clear the box. From a suggestion somewhere it was said to simply use validating. I thought e.handled was correct by that doesn't show up as an option. It works if the input is a number. If not, the messagebox shows and closes on OK but I can't do anything else. Any click (even to 'X' the window) anywhere brings up the messagebox. This is basically what I've tried:
Private Sub txtKidsAnswer_Validating(ByVal
sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles txtOddsAnswer.Validating
If IsNumeric(txtKidsAnswer.Text)
[code]....
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Dec 9, 2010
I am looking into data validation as I need a way of setting a textbox to only accept numeric values. I have had a search for this and it doesn't seem as straight forward as I had hoped.
I have found a couple of possible methods, although the sites which I found them where very unclear on how they actually work. I feel strongly that I should know how all of my own programs work >_>
I have no actually got this to work with my program yet. Are there better methods than this?
Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Dim allowedChars As String = "0123456789$,"
[Code].....
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Apr 2, 2009
I have form with ComboBox and TextBox. ComboBox has values A, B. And I would like to validate TextBox. If user select A so TextBox need to check for numeric and amount of numbers can't exceed 10 characters. If will entered not numeric characters error will indicated. If user select B so TextBox will check for string and user can enter any characters. Only if box is empty error will indicated.
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Sep 8, 2009
best way to check if a textbox has only 4 numbers and isNumeric, for example i need to enter postcodes.I currently have:
If CDbl(txtPostcode.Text) <> 4 Or Not IsNumeric(txtPostcode) Then
MessageBox.Show("Postcode must be 4 Digits", "Error")
But the message box comes up regardless of whether there is 4 numbers, letters, or anything in the textbox. Its also used in the leave function of the textbox.
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Feb 2, 2010
I'm trying to write an application that will allow a non-administrator user to create virtual directories in IIS6. I've tried numerous different ways of impersonating a administrative account but nothing seems to work to create the virtual directory.
Here's some of what I've tried:
dim sDirPath as string = "IIS://remotehost/W3svc/1/root"
Dim de As DirectoryEntry = New DirectoryEntry()
de.Path = sDirPath
de.AuthenticationType = AuthenticationTypes.Secure
de.Username = tbxUsername.Text
[Code] .....
what is the correct way to impersonate another user in winforms application that will allow me to create the virtual directory without the user that's running the application being an administrator on the web server? I know this can be done, IIS manager allows you to use "connect as" checkbox to do it.
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Aug 2, 2010
I have the following validation which works fine for numeric textbox i.e., txtprojstart, however I want to update it for datetime textbox instead of numeric... See code below
[Code]...
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Oct 20, 2009
I validate TextBox for numeric and length no more then 7 characters. I'm checking for Not IsNumber and Len. But I want to give a user to save record when TextBox is blank.
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Jun 3, 2010
I found a function that validates the numberic and decimal input for a textbox and works exactly like I want. But it does not let me limit how many numbers after the decimal. how to do this in the same function?
[Code]...
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Apr 19, 2012
Is there a way to set a textbox in vb such that it does not accept a space or a non-numeric character entered by a user? I am writing a program that has a textbox called "phoneField" in which the user should type in only numbers and if the user trys to type a non-numeric character or space, nothing should be displayed in the textbox. How could that be done?
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Jun 22, 2010
This is a Library code I got from Microsoft for format a textbox into a numeric format...but it's doesn't works because error message "numberFormatInfo is not defined".
Public Class NumericTextBox
Inherits TextBox
Private SpaceOK As Boolean = False
' Restricts the entry of characters to digits (including hex),
' the negative sign, the e decimal point, and editing keystrokes (backspace).
[Code] .....
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Jun 22, 2011
This is my first attempt at creating a Winforms application, and I have been developing in the .Net Framework (Silverlight, ASP.Net, WPF) for about 6 months. So, my appologies if this is a newbie question.
Basically what I am doing right now is taking the drawings of a stylus-based input, and storing them into an image field in a SQL Server database. Then, in another form, I go and get that image out of the database, and load it into a picture box. It works, but it is rather "sloppy" how it got there.When the user clicks save, it stores that image into a temporary folder, then converts it to a byte array and throws it into the database that way. Then, it deletes the file from the temporary folder. When retrieving it, it pulls it out of the database in a byte array, then converts it to an image in a temporary folder, thus displaying it on the form.
Is there a way that I can just bypass the storing of the file onto the user's harddrive both times, and go from byte array to picturebox?
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Feb 6, 2012
I'm working on a Form that contains a datagridview and textbox, I need the datagridview detect any letter of the alphabet or numbers, then select the input and send the key pressed to input.
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Mar 24, 2010
How would you verify a textbox if contains at least one numeric digit and one alpha character using loop?
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Apr 6, 2012
Is there a numeric text box, not an up-down box, a SIMPLE numeric box into which the user can place a number, 5 boxes actually, then on command have the five boxes added and the sum displayed?
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Apr 17, 2010
What is the code to lock a Textbox? The following code throws an error:
txtVNO.LOCKED = True
The error is : 'Locked' is not a member of 'System.Windows.Forms.Text'
Then how to lock a textbox?
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Aug 22, 2011
VB.NET Windows Forms Project, VS2010.I have a tabcontrol with several tabpages and on each tabpage there is a textbox. I want the focus (and insertion point) to go to the end of the text in the textbox when the tab is selected. If I make a junky project with the following code in each tab, it works fine:
Private Sub TabPage1_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles TabPage1.Enter
With TextBox1
.SelectionStart = .Text.Length
.Select()
End With
End Sub
However, the same code is not working in my actual project. I am having trouble debugging, because if I step through, the breakpoints and IDE mean the focus events don't fire in the same order.
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