Form validating event vb net
Within your "Accept" button click handler (the "save" button) process each control that Causes Validation to ensure that they are all valid... (Assuming you are not placing conflicting date in there by the program) It will be executed as that control looses the focus. Cor Phill, Now I understood you, in fact do you want to check if they are not empty?
When you click on the button the validating event fires. If the handle matched then immediately exit the Validating event without setting e. -- Al Reid Well it works for me - but one thing I left out - you need to set the cancel buttons 'causes validation' to false. Also note that the "trick" to closing the form is not keeping a seperate "canceling" flag, but to put "e.cancel=False" in the forms closing event.
Hi All, I am writing a simple win form which contains a button, when user click the button i want to validate all the other textbox and see if there is anything goes wrong may i know how can i trigger the validating event for all text box? thx and regard,s Norton Norton, It sounds for me as a horse behind the car.
thx and regard,s Norton Norton, I got the following tip from "Windows Forms Programming in C#" by Chris Sells, from Addison Wesley. How can something be wrong in a textbox when you use correct the validating event.
This will future proof your code as much as possible and prepare you for any breaking changes down the road to the internals of the Framework.
I have a form w/ a textbox and Cancel button on it. When I click on the cancel button it doesn't even get to the cancel.click event until AFTER it has done the validating. As far as the original validation issue, I started a new project (VB2005) and tried your approach It works except that pressing the Esc key still causes the validation event to fire. According to the documentation: "The cancel button for a form is the button control that is clicked whenever the user presses the ESC key." Which says to me the behavior s/b the same! Validating If Not mbln Cancel Then Dim dte Date As Date Time If Date Time. Also note that the "trick" to closing the form is not keeping a seperate "canceling" flag, but to put "e.cancel=False" in the forms closing event.
One, remove the "control Box" from the form, so the user cant close it that way. in the btn Cancel_Click event: Removehandeler Text Box1.validating, Addressof Text Box1_Validating -- Terry "Darin" wrote: I know that, but the problem is when the user clicks EXIT, the textbox.validating event is called BEFORE the cancel.click is done, so the textbox is being validated. According to the documentation: "The cancel button for a form is the button control that is clicked whenever the user presses the ESC key." Which says to me the behavior s/b the same! To Short Date String Else Msg Box("Please enter a valid date.") e.