如何将datetimepicker默认设置为空?

在Load中,初始化
this.dateTimePicker1.Format=DateTimePickerFormat.Custom;
his.dateTimePicker1.CustomFormat=" ";
在事件里写:

private void dateTimePicker1_ValueChanged(object sender, System.EventArgs e)
{
//this.dateTimePicker1.Format=DateTimePickerFormat.Long;
this.dateTimePicker1.CustomFormat=null;

}
这样就实现了,在程序初始化时dateTimePicker显示为空

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