Forms :: Validate Textbox Empty?
Mar 1, 2011
I 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].......
View 2 Replies
ADVERTISEMENT
Mar 5, 2009
I 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.
View 6 Replies
Sep 22, 2009
I'm doing a programming course at college, and I'm making a simple program that finds the mean of three numbers. Making the basic program was easy, but I can't work out how to validate the text boxes so that they only accept numbers. I've Googled, but I haven't been able to find anything. I have a look on the forums here but couldn't find anything either.
View 3 Replies
Feb 17, 2010
I am new to Win Forms, I have a scenario here..When User enter ID in a textbox, I want to check that value in database and get the name for that ID before submitting the Submit Button.
View 1 Replies
May 11, 2009
I 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 Replies
Aug 19, 2009
I am using VB.net to create a simple winform. I have the option to save the data I input on that form. I am trying to prevent the user not to save the data if textbox10 is empty. I tried the while loop but I go into an infinite loop. The code is below. The if statement gives the error but allows the user to save.
[Code]...
View 6 Replies
May 30, 2012
I'm working on a program to delete files from a certain folder after they have aged a certain amount of time and either match via regex or extension. I'm running into an issue where files() could be:
files(0) = Nothing
files(1) = Nothing
files(2) = Nothing
etc....
Right now the way it is written, I could place
Else
log(1) = data(1)
log(3) = "Array field empty"
InsertLog(log)
And the program would log as many files as file(i) = Nothing holds. This would create redundant database records and is not wanted. Is there a way to figure out if ALL files(i) = Nothing and then place code in there to insert into the database?
'If log(3) is successful that means no files were old enough or deleted successfully
If log(3) = "Success" And IsArray(files) Then
For Each file In files
If Not file.IsNullOrEmpty(file) Then
'If files is actually something insert into the log
log(1) = file
[Code] .....
View 3 Replies
Aug 8, 2009
How to validate all empty text box in a form on button click? If text box empty change color.
View 9 Replies
Jun 1, 2010
The problem is that if you never enter anything into a cell for a new row then that cell is never validated. This is a problem because I have columns that should not be null. I am doing the check in the row level validation and storing the information about which cells are empty that should not be empty. The row level validation works fine and the row level validation error indicator goes on,(red exclamation mark at the beginning of the row) but I also need a visual indicator on the individual cells that are in error.
I am thinking that setting the HasError property for the cells that are in error should cause them to display n error style (the default red border). Is there a way to this this either from XAML (perferably) or from code?Alternatively I could cause those cells to re-validate when the row editing is finished. Does anyone know how to do this?
View 1 Replies
Mar 28, 2009
i created a validation procedure on a textbox_validating event. the procedure goes something like [Code] but somehow it doesn't stop the system from continuing. what happens is on my Save Button where i have. [Code] i'm assuming that when i click the save button, the Textbox1_Validating event is also fired since it also brings up the MessageBox. but then after pressing OK on the MessageBox, it continues to try and Update the DataTable where I get an error from the database saying that the Column does not allow null values.
also when i click Save Button, i noticed that the Textbox1_Validating Event is only fired when the cursor is on that item. basing from this, it seems that the not all Validating Events are fired when an Adapter.Update is executed. what's the best way to validate items? should it be on the Save Button and not on the Validating event of each items?
View 14 Replies
Nov 22, 2010
I am making a project, a database project using vb.net 2005 at front end ans sql server 2005 at back end. i have to validate my form, like for sTUDENT ID, only numbers are acceptable. that what is the way to validate it? the way which i have used is
[Code]...
View 3 Replies
Apr 12, 2012
Ok.. 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].....
View 6 Replies
May 1, 2009
how i validate the textbox textbox only get integer value and after that this integer value assign to a integer variable.
View 12 Replies
Mar 24, 2010
I 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]...
View 7 Replies
Jan 15, 2012
how to validate the text box value? I have one class with function for validating the duplicate value of sql table.
[Code]...
View 10 Replies
Apr 10, 2010
How could i validate a textbox in vb.net, so that it gives error message if i enter anything apart from alphabets?
View 3 Replies
Jul 6, 2009
I 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.
View 3 Replies
Apr 1, 2011
i 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.
View 2 Replies
Aug 31, 2011
How to not accpet string in textbox only numbers will be validate..for the textbox contact no. and ge..
View 9 Replies
Jun 12, 2011
Since 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.
View 9 Replies
Sep 8, 2009
If the user enters non-numeric and numeric values in a textbox, how do I keep only the numeric part?
View 3 Replies
May 4, 2012
how 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?
View 8 Replies
Mar 11, 2010
VB .Net : how to validate textbox to get only alphabets a-z , A-Z..
View 7 Replies
Mar 30, 2010
I 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].....
View 1 Replies
Jun 18, 2009
Is 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 ( | )?
View 17 Replies
Jun 24, 2010
I 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].....
View 2 Replies
Sep 20, 2009
I have a question about how to validate a text box with only word inside. Below is my code i use, it's only can detect if number 1 to 9 in single number, but not 11 or 999 or Joanne11 Joa223nne etc. I want it can detect the text box have and number or symbol then will show an error messageBox, else continue.
[Code]...
View 3 Replies
Oct 21, 2010
this is my code in VB.NET 2008 and it works as the result, i can input starts from 1.00 until 99.99
but i need more than this i want the textbox automatic validate the input as i typed in the textbox
example: i typed "1000" then the textbox will write "1,000"
example: i typed "10000.99" then the textbox will write "10,000.99"
nb: it has to disabled from typing ","
[Code]...
View 3 Replies
Apr 20, 2011
I have been searching for an easier way to validate the text property of my combobox.
Below is a background of what I am try to accomplish:
I have a from that contains many controls, mainly comboboxes that are bound to datatables. I have these set up in such a fashion as to when the user begins to type, the values begin to show and auto populate the combobox. This makes the selection process easier to select an actual value in the list. But, as we all know, you can lead a horse to water but you can't make him drink. Users still have the ability to type something that is not in the list. I do not want to allow them to leave the combobox until the have selected or typed a valid value from the list because I am building a SQL query to retrieve data for a later form. I don't want to lose the above mentioned functionality of being able to type it in. I currently have it working as follows, but there must be a more elegant way to do this.
I first populate my combo box like so:
CODE:
The part I don't like the most is that I feel like I should be able to use the list already loaded in the combobox data, but I can't figure out how to do it. So I end up having to reload it, this seem like a waste of time.
View 3 Replies
Mar 20, 2009
I 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 Replies
