Questions tagged [validating-event]
16 questions
21
votes
1 answer
Why is my validating event not firing in C#?
I have a form that is dynamically created. It is a winForms application.
This form is just a menu and a series of textboxes and labels. For the sake of this example, you can ignore the labels.
My problem is: When I edit stuff in the textboxes, then…
Jerry
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3
votes
2 answers
Cancelling TabPage.Validating locks my UI
I have a TabControl with multiple TabPages which each contain multiple controls. When a user moves away from my tab using a button, I want to validate that the controls on that tab were modified correctly. Specifically, I want to check that they…
Freefall
- 73
- 5
2
votes
2 answers
C# Validating event: test for blank textbox and number validation?
So I'm trying to create a validating event that makes sure a textbox isn't empty and that the number entered doesn't exceed 2000. I've posted what I have but every time I run it I get a message that the exception wasn't handled because the "kwh =…
rachelabr
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1
vote
1 answer
C# TabStop in Validating not working
if i have these lines in my TextBox_Validating the tabstop on the TextBox will fired twice:
((TextBox)sender).AutoCompleteCustomSource.AddRange(new string[]
{
((TextBox)sender).Text,
});
But if remove the lines above the Tabstop works fine and…
Dung3onK33p3r
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1
vote
1 answer
Same event handler for two events which requires different signature
I have a method that I want to invoke both on the TextChanged and Validating events. The problem is that the e parameter of TextChanged is of type EventArgs while the e parameter of Validating is of type CancelEventArgs.
I could obviously do…
Michael Haddad
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1
vote
2 answers
Skipping validation for closing the form from the controlbox
I have a simple form with a textbox and I want to make the user to enter some data in the textbox before closing or skipping this control,but when I handle the validating event I 'm only able to close the form by putting a Cancel Button with…
user1831490
0
votes
0 answers
Adding values to datagridcomboboxcell during validation + hitting Enter = Null Reference
I have a datagridview displaying user information. The datasource is a dataset table, and I want the values of this dataset to change dynamically when the use edits the values in the datagridview. To do this I have harnessed the datagridview's…
user1723280
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0
votes
3 answers
Validating Text input with val()
I try to validate the Input in my website because of Cross-Site-Scripting-Attacks!
0
votes
1 answer
validating control in function of destination
I have a TextBox that should contain a file name.
It's mandatory for the program to work so I've put:
Private Sub tbScanFilter_Validating(sender As Object, e As CancelEventArgs) Handles tbScanFilter.Validating
If tbScanFilter.Text.Length = 0…
Massimo Savazzi
- 159
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0
votes
2 answers
How to avoid duplication of validation events Winforms
I am creating a project which will consist of three forms, one parent form which will be a decider on which form to load. Due to the two child forms being slightly similar, a lot of validation is the same. I have my methods for validation which are…
whatdoyouNeedFromMe
- 105
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0
votes
1 answer
Validation using Validating event and ErrorProvider - Show Error Summary
How to show Messagebox "Data is invalid" when there is errors left in my WinForms.
Tried something like but it does not work.
if (errorprovider1 == !null)
{
MessageBox.Show("Data is invalid");
}
Maybe i have to use bool for this solution.
My full…
Roberts Šensters
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0
votes
1 answer
Tabbing off control bypasses validation .NET
So, I have a User Control which is just a TextBox with special formatting rules (there are reasons why I'm not just using a MaskedTextBox...y'know...the sensible solution).
Anyhow, when the user inputs invalid data, they can't click off using the…
Greg
- 1
0
votes
1 answer
Validating Event Not Firing
I'm having real trouble getting the validating event to fire. I have created a very simple windows form to demonstrate the problem. The form contains two textboxes and I'd expect the validating event to fire when the tab key is pressed in the first…
Simon Bondsfield
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0
votes
1 answer
how to validate the Textbox allows only first character Capital latter in c#.net?
I have a task, my textbox accepts only first character capital lettr and remaing characters normal.
user1858718
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0
votes
2 answers
C# TextBox.Validating Cancel Event for ASPX
I'm trying to convert code from a WinForm to a WinApp, but I know very little of aspx, and nothing of javascript.
I have programmatically created a textbox that will be given text. The text is then passed through a validation method like…
user1015106
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