Date time picker validations

Question

I am sorry for posting this question as it may be find silly to all, but I am not getting the exact solution.

The question is: I have a Date time picker in my proje

Answer 1

Please correct the code and see if it works

               if (dateInsert.Value.ToString() == "")
              {
                MessageBox.Show("Please select date!");
                dateInsert.Focus();
                return;
               }