DateTimePicker dtp = sender as DateTimePicker; DateTime april = DateTime.Today.Date; if (dateTimePicker1.Value < april) { MessageBox.Show("You are not allowed to select older day than today!"); //unregister the handler first dtp.ValueChanged -= dateTimePicker1_ValueChanged; //set the value dateTimePicker1.Value = DateTime.Today.Date; //register handler again dtp.ValueChanged += dateTimePicker1_ValueChanged; } else { //If selected date is today or up, do something. }
var
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