dtp.Format = DateTimePickerFormat.Custom;
dtp.CustomFormat = " ";
dtp.Value = DateTime.FromOADate(0);
dtp.Text = string.Empty;
参考链接：
How can I make a DateTimePicker display an empty string?
[WinForm]将DateTimePicker设置为空值显示
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转载自www.cnblogs.com/dabao0312/p/8920965.html
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