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Optionally, invalidates the child controls assigned to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.(Inherited from Control.)Invalidates the specified region of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

Optionally, invalidates the child controls assigned to the control.(Inherited from Control.) This API supports the product infrastructure and is not intended to be used directly from your code.

Does anyone know of a way I can run my validation code when one of these buttons is clicked (or any other button). events to be raised by the currently selected control. Interacting with menus and toolbars does not cause the currently selected control to lose focus, which means that validation is never triggered.

If you think about it carefully, this even makes sense.

This is particularly useful if you are using complex validation patterns.

A good place for this is the additional instructions section of your question title.

You can also apply formatting validation to a textbox question after the fact on the Validation tab.

If you select a numeric validation, you can choose to Force Whole/Positive Numbers and/or Allow Values Between a minimum and maximum range.(Optional) When using validation we recommend displaying an example format to your survey respondents.

You can quickly validate the Multiple Textboxes question type to allow only numerical data (positive whole numbers), and to reveal the option to require a fixed sum.Hi I have a windows form containing a menu bar, tool strip and a Data Grid View control. I have had a look at the events on the Data Grid View such as the 'leave' event however none seem to do what I want. 'leave' does not run when either of the save buttons is clicked. I have a save button on the tool strip and a save menu item. My problem is that if a cells value is changed and then either of the save buttons is clicked, validation does not run and so the new value is not saved.A lot of forms set the of the field to 16 characters which means that you can type most of your number - using spaces or dashes to separate blocks of numbers - before running out of space and having to go back and remove the spaces before entering the rest. Others will let you enter the number with extra characters, but then send you back an error message when the form is submitted. Let's see how we can do it better: What have we done then?: When the form is submitted the credit card input will be numbers only which is handy for processing, but you shouldn't force the user to do the work for you.Everyone knows that a credit card number is normally made up of 12-16 numbers.

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