How to raise a validation event from a key press

I want to raise the:

private void txtbox_startdate_Validating(object sender, System.ComponentModel.CancelEventArgs e)
    {}

Function from a key leave event. The leave event looks like:

private void开发者_运维问答 txtbox_startdate_Leave(object sender, EventArgs e)
    {}

The trouble is of course if I try and call it in this manner:

txtbox_startdate_Validating(sender, e)

An error is raised because in this case e is an EventArgs whereas the validation function wants a System.ComponentModel.CancelEventArgs and so, how do I convert EventArgs to a System.ComponentModel.CancelEventArgs or create one so that I can call my validation function?

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See MSDN:

http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating.aspx

You have no need to call the txtbox_startdate_Validating event (or any other control with a validating event) from the txtbox_startdate_Leave event as it's the order of the events to go from one to another as part of the design.

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normally whatever the validator is, you can just call Validate() on it instead of doing this.

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.basevalidator.validate.aspx

Otherwise, just 'new' the canceleventargs yourself - it's not special, the constructors are public.

http://msdn.microsoft.com/en-us/library/system.componentmodel.canceleventargs.canceleventargs.aspx