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.
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].......
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] .....
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?
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")
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
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.
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.
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?
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
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
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,
I 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.
I 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.
i 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
I 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]...
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)
I 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.
i need to validate the textbox such that in can accept numbers only but the entered no should be greater than 0 , it can be 0.1 and should be less than 101.
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?