Form.ValidateChildren Method (ValidationConstraints)
.NET Framework 4.6 and 4.5
This member overrides ContainerControl.ValidateChildren(ValidationConstraints), and more complete documentation might be available in that topic.
Causes all of the child controls within a control that support validation to validate their data.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
'Declaration <BrowsableAttribute(True)> _ Public Overrides Function ValidateChildren ( _ validationConstraints As ValidationConstraints _ ) As Boolean