Not Validate A Char In Textbox?
Aug 31, 2011How to not accpet string in textbox only numbers will be validate..for the textbox contact no. and ge..
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Validate String To Have No Space Char And Only First And Last Char As Delimeter
Mar 30, 2012I need validation for string to comply with next: no space char starts with one delimiter char ends with one delimiter char has no other char as delimiter char. Updated sorry missed that should only be one delimiter char at start and at the end
View 2 RepliesHow To Clear Last Char In Textbox
Jun 30, 2009How I can clear last char in textbox in c# when I press key like D0 (mean when I press D0 clear 0 in my textbox)? Or don't let me enter 0? You know I don't want user cant enter number in textbox .
View 4 RepliesForms :: Get The Key Char On Key Down Event Of Textbox?
Mar 23, 2009On the KeyDown event of the textbox, i need to capture the character pressed and send it to a function which fires a sql query for this character.To get the character i am using Convert.ToChar(e.keycode).However Convert.Tochar converts the keycode to char according to its ASCII value , thus F4 gets converted to "s" as "s" has ASCII keycode of 115.Is there some other way to convert the keycode to character which won't make these wrong conversions as even if i restrict the functions keys there may be problem with other key conversion also.
View 2 RepliesHow To Validate For Textbox
Apr 12, 2012Ok.. i'm trying to validate a textbox, and i think i got the code pinned down, however,after it is validated.. how do i loop so it lets you input the data in again after you have entered incorrect data
Do
NameNew = txtName.Text
If txtName.Text > 100 Then MsgBox("too high")
[code].....
How To Validate Textbox
May 1, 2009how i validate the textbox textbox only get integer value and after that this integer value assign to a integer variable.
View 12 RepliesHow To Validate Textbox In Wpf
Mar 24, 2010I want to write 123.32 i have implement validation but it does not include "."
how to include it
If (e.Key > Key.D0 And e.Key < Key.D9) Or _
(e.Key > Key.NumPad0 And e.Key < Key.NumPad9) _
Or e.Key = Key.Back Or e.Key = Key.Tab _
Or e.Key = Key.Decimal
[Code]...
How To Validate Textbox Value
Jan 15, 2012how to validate the text box value? I have one class with function for validating the duplicate value of sql table.
[Code]...
Validate A Textbox In .net?
Apr 10, 2010How could i validate a textbox in vb.net, so that it gives error message if i enter anything apart from alphabets?
View 3 RepliesRead Individual Char In TextBox And Send To Comm?
Apr 11, 2011May I know instead of using WriteLine(MyTextBox.Text) to send data to a serial port, how do I send character by character? Use BaseStream.Write?
Now:
Dim ComLine As Ports.SerialPort
ComLine.WriteLine(MyTextBox.Text)
File I/O And Registry :: Read Char By Char From A String?
Dec 16, 2008i want to read a character 1 by 1 from a string and a .txt, i know all about stream reader so for the .txt would it be somthing like:textbox1.text = tr.readCharacter.i would prefer to be able to read from a textbox or String array though.
View 10 RepliesCannot Validate Textbox When Empty
Mar 5, 2009I have a form with a textbox, and i would like validation to occur so that a blank field is not allowed
e.Cancel = String.IsNullOrEmpty(TextBox.Text)
Does not always work, because it still allows me overwrite an existing field with blank spaces, and then update.
How To Validate Character Within Textbox
Jul 6, 2009I am trying to validate the character within a textbox. The textbox has a MaxLenght of 1
Private Sub textbox1_TextChanged() Handles textbox1.TextChanged
If allowed_characters.Contains(textbox1.Text) = True Then
textbox2.Focus()
End If
If allowed_characters.Contains(textbox1.Text) = False Then
textbox_userid_input01.Clear()
End If
End Sub
When I enter something in textbox1 at the debug it will do the if contain = false
but the if contain = true doesn't work. I tried a lot, but it still doesn't recognize true.
How To Validate Different Textbox Input
Apr 1, 2011i have this code:
If TextBox1.Text = "" Then
Label2.Text = " feild empty "
Elseif TextBox1.Text <> "1234" or "7463" or "3625" or "7642" Then
[Code].....
it works when its only only content "1234" but i need to place more than one possible valid input.
Validate A Textbox Content?
Jun 12, 2011Since my last thread hasn't been answered and I simply cannot wait until it gets answered, how can I validade what is being written on a textbox?
I need to know when the user types a "-" (minus) char. And when he do so, an message appears (preferably an ballon or a tooltip) and says that is illegal to type this char in particular.
Validate A Textbox To Only Contain Numbers?
Sep 8, 2009If the user enters non-numeric and numeric values in a textbox, how do I keep only the numeric part?
View 3 RepliesValidate Input In A Textbox?
May 4, 2012how one would go about validating input into a textbox for example:
Lets say the first letter the user enters has to be 'A' and the third letter the user enters has to be any number ranging from 0-9 and the length of their input cannot exceed lets say 10.
This is what I have so far:
If txtOperatorID.TextLength > 10 Then
bErrorOccured = True
sErrorMessage = sErrorMessage & "-No more than 10 chars" & vbCrLf
[Code]....
The coding for the length works(is there a better way to do this)? The coding for the first letter to be A works but then I have no idea how to set validation for any proceeding characters entered. Am i right in thinking I have to find their position somehow in the string if so how?
Validate Textbox To Get Only Alphabets A-z , A-Z?
Mar 11, 2010VB .Net : how to validate textbox to get only alphabets a-z , A-Z..
View 7 RepliesValidate That Textbox Is A Number?
Mar 30, 2010I need to validate that my textbox is a number. I found this example online, but it says that Type RegExp is not defined. How do I fix it?? Here is what I have:
Private Sub txtAnswer_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtAnswer.TextChanged
Dim myReg As RegExp
[Code].....
Validate The Value Entered Within A Textbox?
Jun 18, 2009Is it possible to validate the value entered within a textbox by comparing it with a text file that is full off accepted values?
in my textbox will be a location like London, i want to be able to validate that it is correct by looking in my text file to see if it is there?
my textfile would be written like this:
|london|manchester|birmingham|leeds|bristol| ... etc so it need to split the values by looknig with the pipe characters ( | )?
Way To Validate Textbox Values?
Jun 24, 2010I am trying to validate textbox values during runtime in vb.net I have following code which is validating txtno from database table tblmachines. But i have problem with chartype and stringtype. Is there any other solution to fix that problem?
Private Sub txtno_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtno.KeyPress
If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then
[code].....
Set Char Number Limit And Handle Special Chars In TextBox?
Jan 28, 2009I am a new VB programmer and am using TextBox in VB2008. Here are the problems I experienced in TextBox -
1, After I typed number in TextBox and found I need to type another number. So I used backspace key to remove it. But at this time program quit and displayed this problem: InvalidCastException was unhandled. How to solve this issue?
2, Can anybody tell me how to set number of characters are allowed to be typed in TextBox?
3, Can anybody tell me how to implement the feature that only numbers are allowed to be typed? In case letters are typed, how to tell user to re-type?
Forms :: Validate Textbox Empty?
Mar 1, 2011I started editing an existing code (basicaly to learn vb) without any real previous experience. Well let's get to the point;I have a form that gathers data from db ordering by user ID (on click count).I have one DataGridView with a list of user,some have data in db, some have not. I came so far that if I CLICK on a user that have data, all data is dissplayed in 6 dinamyc textboxes.If user has no data inly first (emty) row with 6 dinamyc textboxes is created.
BUT THE POINT IS (my question to you) - I have a button that simultaneously adds a row of dinamyc textboxes bellow and multiplyies textbox04 (name is clickcount & 4) and textbox05 and displays the result in textbox06.I want to add a messagebox that shows if textbox04 & 05 are empty and in that case exits sub. Here is my code so far:
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Reset warnings[code].......
Validate A Textbox From A Centralized Code
Mar 20, 2009I am using visual basic dotnet 2008 .I am in need of validating the controls in my forms. but the validation code should not be created for each form , so how to validate the textbox from a centralized code,
View 2 RepliesValidate A Textbox+dropdowns In Vb For A Asp.net Form
Feb 16, 2011I have set it up to email me should someone submit this form and an error occur and right now should that occur for most integer or datetime fields if they fail to validate then it will show me which fields in the email failed and what was input into them.
Problem I'm having now is to validate the drop downs and the textboxs in a similar way to what I with integer and datetime fields so I can display those also in the email in case they error.
present integer and datetime validation
[Code].....
Summary:- Need vb code to validate if strings and dropdowns are valid and the use of try/catch block is another possible solution but I wasn't able to figure out how to implement validation for that either.
Validate A Textbox.text Value To A Currency?
May 15, 2010I want to validate a textbox.text value to a currency. For example if a user enters $154.45 i want the value to be 154.45 or if the enter USD154.40 I want that to be invalid. how can I do this? basically check that the input is all numbers.
View 10 RepliesValidate Individual Characters In Textbox?
Feb 8, 2012i am trying to validate a string that has been inputted into a text box so that it checks all of the characters in the text box individually. I have got the code to check the first character...
If Char.IsLetter(textbox1.Text) = False Then
MsgBox("Error! Invalide charecters present")
Exit Sub
End If If
I was just wondering if there is some sort of loop that i can do so that it checks all of the characters in the text box.
If Char.IsLetter(txtCustomerName.Text) = False Then
MsgBox("Error! Invalide charecters present in customers name")
Exit Sub
End If
Validate Textbox 2 Decimal Places?
Mar 30, 2010I currently have a calculation that gets performed based on the type of operation a user chooses on my form (+, -, *, or /). I have it check their answer against the correct answer and tell them if they get the answer right or wrong. I need to know how I can check the answer when they choose a division sign that checks only the first two digits of the lbltxtAnswer label. I also currently have a validation that checks for numbers only, so if the user types in a decimal, the error message displays, which I don't want it to do. Here is my calculation and validation [code]...
View 2 RepliesValidate Textbox Allows Only Numeric And Decimal?
Aug 31, 2010it 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)
View 2 RepliesValidate TextBox As Number And Not Blank?
Mar 31, 2010I have this code that is supposed to validate that the value a user enters into the textbox is a number and not blank, but it is displaying the error message even if the user enters a number.
Private Sub txtAnswer_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles txtAnswer.TextChanged
If Not IsNumeric(txtAnswer.Text) And (txtAnswer.Text <> " ") Then
MsgBox("Please enter a number! Try Again!")
txtAnswer.Focus()
Exit Sub
End If
End Sub
I just realized I already have another section that checks if the textbox is left blank, but I still need to check that it is numeric.