date time picker and validate event ( is this a bug ? )

[Michel Posseth [MCP]]

I have a problem with the date time picker validate event wich i believe is
a bug
How to reproduce :

throw on a form a date time picker control and a textbox control

select the validating event of the control and add this code

Private Sub DateTimePicker1_Validating(ByVal sender As System.Object, ByVal
e As System.ComponentModel.CancelEventArgs) Handles DateTimePicker1.Validating
TextBox1.Text = Me.DateTimePicker1.Text
End Sub

start the project

change the standard value of the control but only the day or month ( not the
year ) now move away from the control with a tab

The textbox will show a different value as there is currently showed on your
screen by the date time picker
does someone have a good explanation for this ?

regards

Michel

[Michel Posseth [MCP]]

For people strugling with the same problem

i just found a workaround
create you own custom datetime picker ( copy and paste this code )

Option Strict On
Option Explicit On
Public Class CustomDateTimePicker
Inherits DateTimePicker
Protected Overrides Sub OnValidating(ByVal e As
System.ComponentModel.CancelEventArgs)
MyBase.Visible = False
MyBase.Visible = True
MyBase.OnValidating(e)
End Sub
End Class

This one behaves as expected , however if you have fast eyes or a slow
machine you might see a blink :-)
I consider the standard behavior as a bug

regards
Michel Posseth [MCP]


"Michel Posseth [MCP]" wrote:

>
I have a problem with the date time picker validate event wich i believe is
a bug
How to reproduce :

throw on a form a date time picker control and a textbox control

select the validating event of the control and add this code

Private Sub DateTimePicker1_Validating(ByVal sender As System.Object, ByVal
e As System.ComponentModel.CancelEventArgs) Handles DateTimePicker1.Validating
TextBox1.Text = Me.DateTimePicker1.Text
End Sub

start the project

change the standard value of the control but only the day or month ( not the
year ) now move away from the control with a tab

The textbox will show a different value as there is currently showed on your
screen by the date time picker
does someone have a good explanation for this ?

regards

Michel

[Cor Ligthert [MVP]]

Michel,

Validating a date-time picker?

Is that something they do in Rotterdam?

You can in my idea better validate if the water there is clear enough to
drink.

:-)

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:F1**********************************@microsof t.com...

>
I have a problem with the date time picker validate event wich i believe
is
a bug
How to reproduce :

throw on a form a date time picker control and a textbox control

select the validating event of the control and add this code

Private Sub DateTimePicker1_Validating(ByVal sender As System.Object,
ByVal
e As System.ComponentModel.CancelEventArgs) Handles
DateTimePicker1.Validating
TextBox1.Text = Me.DateTimePicker1.Text
End Sub

start the project

change the standard value of the control but only the day or month ( not
the
year ) now move away from the control with a tab

The textbox will show a different value as there is currently showed on
your
screen by the date time picker
does someone have a good explanation for this ?

regards

Michel

[Michel Posseth [MCP]]

Well Cor ,,,
I currently work in a energy company , an we write software that calculates
energy bills .

A bill has to be made in a certain range of a time span

so before we create new entry`s in the database we would like to "validate"
this entered range, however it gets a bit tricky if the value that is showed
is different from the one that is in memory

have you tried my example of the problem ? , try it out and you will see
that this must be a serious bug .

by the way i found that this is enough to solve the problem

Option Strict On
Option Explicit On
Public Class CustomDateTimePicker
Inherits DateTimePicker
Protected Overrides Sub OnValidating(ByVal e As
System.ComponentModel.CancelEventArgs)
MyBase.Visible = True
MyBase.OnValidating(e)
End Sub
End Class
regards

Michel

"Cor Ligthert [MVP]" wrote:

Michel,

Validating a date-time picker?

Is that something they do in Rotterdam?

You can in my idea better validate if the water there is clear enough to
drink.

:-)

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:F1**********************************@microsof t.com...

I have a problem with the date time picker validate event wich i believe
is
a bug
How to reproduce :

throw on a form a date time picker control and a textbox control

select the validating event of the control and add this code

Private Sub DateTimePicker1_Validating(ByVal sender As System.Object,
ByVal
e As System.ComponentModel.CancelEventArgs) Handles
DateTimePicker1.Validating
TextBox1.Text = Me.DateTimePicker1.Text
End Sub

start the project

change the standard value of the control but only the day or month ( not
the
year ) now move away from the control with a tab

The textbox will show a different value as there is currently showed on
your
screen by the date time picker
does someone have a good explanation for this ?

regards

Michel

[Cor Ligthert [MVP]]

Michel,

Don't take it serious, I saw the validating event and than thought is that
the right place, I made the message. After a while I thought, you are of
course testing the given date to certain possibilities, not if the given
date is correct.

I can assure you that I don't have to test things you say, I take it on your
word.

However sometimes I can not resist.

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.comschre ef
in bericht news:BB**********************************@microsof t.com...

Well Cor ,,,
I currently work in a energy company , an we write software that
calculates
energy bills .

A bill has to be made in a certain range of a time span

so before we create new entry`s in the database we would like to
"validate"
this entered range, however it gets a bit tricky if the value that is
showed
is different from the one that is in memory

have you tried my example of the problem ? , try it out and you will see
that this must be a serious bug .

by the way i found that this is enough to solve the problem

Option Strict On
Option Explicit On
Public Class CustomDateTimePicker
Inherits DateTimePicker
Protected Overrides Sub OnValidating(ByVal e As
System.ComponentModel.CancelEventArgs)
MyBase.Visible = True
MyBase.OnValidating(e)
End Sub
End Class
regards

Michel

"Cor Ligthert [MVP]" wrote:

>Michel,

Validating a date-time picker?

Is that something they do in Rotterdam?

You can in my idea better validate if the water there is clear enough to
drink.

:-)

Cor

"Michel Posseth [MCP]" <Mi**************@discussions.microsoft.com>
schreef
in bericht news:F1**********************************@microsof t.com...

>
I have a problem with the date time picker validate event wich i
believe
is
a bug
How to reproduce :

throw on a form a date time picker control and a textbox control

select the validating event of the control and add this code

Private Sub DateTimePicker1_Validating(ByVal sender As System.Object,
ByVal
e As System.ComponentModel.CancelEventArgs) Handles
DateTimePicker1.Validating
TextBox1.Text = Me.DateTimePicker1.Text
End Sub

start the project

change the standard value of the control but only the day or month (
not
the
year ) now move away from the control with a tab

The textbox will show a different value as there is currently showed on
your
screen by the date time picker
does someone have a good explanation for this ?

regards

Michel