c# - How to make so that you can only enter a date? -

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so need in "year", can enter date only. pop warning something. here's code, if user enters empty value, need add?

if (textbox1.text == "" || textbox2.text == "" || textbox3.text == "" || textbox4.text == "" || textbox5.text == "" || textbox6.text == "")             {                 messagebox.show("Не заполнены все поля!");                 return;             }

put textbox datetimepicker, further: string date=datetimepicker1.value.tostring ("dd.mm.yy")


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