TextBox only numbers (validation)
Hi, here I leave a very simple example to evaluate keystrokes when entering data into a textbox and only allow numbers ignoring everything that is not a number. It is basic but will serve as a starting point to validate any income. The following code ....
TextBox1_KeyPress Private Sub (ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress If (Not Char.IsNumber (e.KeyChar) And e.KeyChar <> Microsoft.VisualBasic.ChrW (8)) Then e.Handled = True End If End Sub
The char type has several properties that we would be very useful when performing validations. In the example we see the property. IsNumber ... Here some more to remember:
IsControl: Indicates whether the specified Unicode character is categorized as a control character
IsDigit: Indicates whether the specified Unicode character is categorized as a Decimal Digit
IsLetter: Indicates whether the specified Unicode character is categorized as an alphabetic character
IsLetterOrDigit: Indicates whether the specified Unicode character is categorized as an alphabetic character or a decimal digit
and many more ... I give you sound advice ... always consult the help.
34 Responses to "TextBox only numbers (validation)"
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thank's!!
Hello
You know I'm just getting started in vb and I'm being taught vn.net 2008, and I want to make a basic calculator such as complex but need not validate the texbox (only numbers) in the code that you expose me problem with the lt and that is not declared, then I guess I will gt problem, as stated to work.
Thanks in advance ..
Look at the characters "<" and ">" are not VB. NET-HTML and should appear as "" respectively. INSTRUCTIONAL thus becomes:
If (Not Char.IsNumber (e.KeyChar) And e.KeyChar Microsoft.VisualBasic.ChrW (8)) Then
is that the question is old lady but I thought xD future visitors.
hello, good
Tabajo need to make a practical, and I have a textbox, and I have to validate if a number or text. For example if I have to enter your ID, I have to verify that it is number, and not how, if someone could help me, thank you very much.
I hope you serve.
You nuemros valid integer or decimal, you can tell how many decimal places to which you accept and will be the symbol of the decimal point or comma, depending on the country.
Public Sub ValidaNumero (ByVal e As System.Windows.Forms.KeyPressEventArgs, _
OText ByVal As TextBox, _
Optional ByVal pbConPuntoDec As Boolean = True, _
Optional ByVal pnNumDecimal As Integer = 2, _
Optional ByVal psSimbolo As String = ".")
As Integer Dim nDig
Dim nCount, esDecimal, NumDecimales As Integer
As Boolean Dim esDec
Dim As String = String.Concat sTexto (oText.Text, e.KeyChar)
If Asc (e.KeyChar) = Keys.Back Or Asc (e.KeyChar) = Keys.Return Then
e.Handled = False
Exit Sub
End If
Then if pbConPuntoDec
If e.KeyChar.IsDigit (e.KeyChar) Or e.KeyChar = psSimbolo Then
e.Handled = False
E.KeyChar.IsControl ElseIf (e.KeyChar) Then
e.Handled = False
Else
e.Handled = True
End If
nDig = sTexto.Length
If nDig = 1 And Then e.KeyChar = psSimbolo
e.Handled = True
End If
If oText.SelectedText "" Then
Then if e.KeyChar = psSimbolo
e.Handled = True
End If
Else
If sTexto.IndexOf (psSimbolo)> = 0 And (nDig - (sTexto.IndexOf (psSimbolo) + 1))> Then pnNumDecimal
e.Handled = True
End If
End If
Else
If e.KeyChar.IsDigit (e.KeyChar) Then
e.Handled = False
E.KeyChar.IsControl ElseIf (e.KeyChar) Then
e.Handled = False
Else
e.Handled = True
End If
End If
End Sub
Here I give you a code to validate only numbers not forget that it is in the keypress event of the textbox you will validate:
Txt_Cantidad_KeyPress Private Sub (ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txt_Cantidad.KeyPress
'Here we check if the pressed key is a letter if so then do not take or do not show the letter.
If Char.IsLetter (e.KeyChar) Then
e.Handled = True
Else
'Here you check if any key is pressed monitoring can be backspace, tabulardor, if so let it go you can delete standard pork.
If Char.IsControl (e.KeyChar) Then
e.Handled = False
Else
'Here you check if a separator or white space, if so do not let it go.
If Char.IsSeparator (e.KeyChar) Then
e.Handled = True
Else
'Check here if the key pressed is a number, so if you skip regular.
If Char.IsDigit (e.KeyChar) Then
e.Handled = False
Else
e.Handled = True
End If
End If
End If
End If
End Sub
thank you very much friend, you doing very well and if it bugs you agradesco
Very good example is very easy to understand its logic and the time is very short compared with others. Thanks
nice ... very useful .. thanks
q x Finally someone deigns to make codes work as people q x over all things! thanks love saved me stress ... tqm!
Good my friends a consultation, giving condigo enmodo console but if it works in web mode not know how to do it by fa ..... give me a hand
Thx .............
WANT TO KNOW HOW CAN VALIDATE THE MINUS SIGN AND THE DECIMAL POINT ... THANKS
hello, good night
Tabajo need to make a practical, and I have a textbox, and I have to validate if a number or text. For example if I have to enter your ID, I have to verify that it is number, and not how, if someone could help me, thank you very much.
Kids this is definitely a blessing, I can not imagine that I would have been without this code
MIL GRACIASSSSSS!!
This is excellent, thanks friend.
This Ok.
This code helped me a lot.
cool ta
chewere
hi all .. very good code, I have served. q I would like to help me now and I'm working with a q q contains an object grid DataGridViewComboBoxColumn code i going to see if I help you find the error or q he needed:
BtnAddRequisito_Click Private Sub (ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnAddRequisito.Click
Dim As String = Negocio.Conexion sConexion
As New DataSet Dim Ds_datos
As String Dim sQuery
CboRequisitoColumn.Name = "Subject"
Me.DGVMaterias.Columns.Add (CboRequisitoColumn)
sQuery = "SELECT asg_codigo as code, description FROM asg_nombre as spsatbasignatura WHERE asg_semestre <" & Me.CMBSemestre.Text
Ds_datos = Accesar_Datos.GetDataSet (sQuery, sConexion)
my_DGVCboColumn.DataSource = Ds_datos.Tables (0)
my_DGVCboColumn.Name = "Data"
my_DGVCboColumn.DisplayMember = Ds_datos.Tables (0). Columns ("description"). ToString
my_DGVCboColumn.ValueMember = Ds_datos.Tables (0). Columns ("number"). ToString
Me.DGVMaterias.Columns.RemoveAt (0)
Me.DGVMaterias.Columns.Insert (0, my_DGVCboColumn)
End Sub
'The former creates the grid
'The following is where I want
'Assign or insert the code gives me q
'My_DGVCbocolumn object q is within q DGVMaterias xq I think I should not
'Refer to CboRequisitoColumn
Private Sub Agregar_Requisitos ()
SQuery Dim As String = ""
Dim As String = Negocio.Conexion sConexion
As New DataSet Dim Ds_Datos
KROW Dim As Integer = 0
Dim aux As String
Dim r As Integer
Try
For KROW = 0 To Me.DGVMaterias.RowCount - 1
aux = Me.my_DGVCboColumn.Items (KROW). ToString
r = CType (aux, Integer)
sQuery = "spi_spsatbrequisito_asignatura" & Code & "" & r & ""
Ds_Datos = Accesar_Datos.GetDataSet (sQuery, sConexion)
Next KROW
Catch ex As Exception
MsgBox (ex.Message, MsgBoxStyle.Critical, "Error")
End Try
End Sub
'Beforehand by
hello, I would like to know how do to q in a single box to type in letters and no numbers.
pd, I need to as soon as possible if it can be better today.
thank you very much for your attention.
TextBox2_TextChanged Private Sub (ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox2.TextChanged
If IsNumeric (TextBox2.Text) Then
MsgBox ("Must be letters")
End If
End Sub
Hey your code is not valid.
Q Only show message saying not contain letters, but if you remove the message does naaa.
e.hendled put the same and put the opposite .... if you change false to true and vice versa ....
thank you very much! x I'm doing this blog I proje xq and no longer gives me the head if they could help me with this thank you:
I have a form where income and other data with a grid where q is consulted but when I want to see from the first q I have saved the information in the grid fails naa naa I filter on the primary key but not <if they inspire me thank you
as I can do to make a textbox then appears a legend when entering data in another textbox?? if someone could help me be grateful
query as you can make when entering the numbers to texbox these points automatically put the thousands
you can format it using the LostFocus event:
TextBox1.Text = Format (TextBox1.Text, "Fixed")
for example.
Please can you help me, I need to validate the entry of numbers into a text box, I have validated that supports only numbers, now I need to validate the entry of the first number that is only number 2.
know from there I found some code a bit complex to type text or numbers only, but if I bring a very simple code, and simplemte enough to change a single parameter to make the difference between accept text or numbers, well no more to say and Waiting sae them very useful here I go:
first we refer to:
Imports System.Windows.Forms.Form
and then create a function that contrendra the master code to verify its contents as follows:
KeyAscii As Short Public
'Function to allow only numbers, period, comma, backspace and enter
Tecla_Presionada Function (ByVal KeyAscii As Short) As Short
If InStr ("0123456789.", Chr (KeyAscii)) = 0 Then (so only accept numbers, and what expliqye as above, but if we take "= 0" will only support the reverse points, I hope I understand but then I explain ...)
Tecla_Presionada = 0
Else
Tecla_Presionada = KeyAscii
End If
Select Case KeyAscii
Case 8
Tecla_Presionada = KeyAscii
Case 13
Tecla_Presionada = KeyAscii
End Select
End Function
Once the function we go to textbox1 so to speak you will know as it is known that if the KeyPress event and digitamos the following:
TextBox1_KeyPress Private Sub (ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Dim KeyAscii As Short = CShort (Asc (e.KeyChar))
KeyAscii = CShort (Tecla_Presionada (KeyAscii))
If KeyAscii = 0 Then
e.Handled = True
End If
End Sub
And we treat the program ready and that's it, that's all folks I hope is useful to them, until then, any questions comment ...
Very good and useful your post!
nserio saved me!
many graciass
=)
To be perfect you just have to eat the digital control and automatic placement of thousands of points.
Thanks
hello I would like to help me q q a textbox I accept only letters and spaces
I need it as soon as possible thanks
hello I will be able to help with the code to accept but I need to extract data from the Bd but not how porfis if they are the agradecede ...
hi I'm also starting to create a visual basic text editor visual basic, I have a question to ask in a RichTextBox when I write words for example. "Hello World" that I want white space to fill with * would remain so "Hello * world," but not what the function, I will not do it directly in the RichTextBox if that means a button as you finish typing give the text to the button click to call the function (if it is a function) and all the blanks in the RichTextBox fill me with * which is the source code or what is the function to do this and how would call the the function button (in case of a function). Indeed it is in Visual Basic 2008
This comment has been very helpful either m