Create a constructor on form2 with input parameter as date time. And when you create object of form2 in form1 just pass the date value using C# in window application.
form1 coding: DateTime objdate = dateTimePicker1.Value; form2 objform2= new form2(objdate) objform2.show(); Form2 coding: DateTime dateen; // Constructor public form2(DateTime str) { dateen = str; }