I am not sure what exaclty you requirement is. From what I understood you are trying to copy a textbox value to another textbox in the edit form. Here I have implemented a form template editform with two textboxes and one copy button. On clicking the copy button text from one texbox will be copied to the second.
my problem is:
Ex: i've 10 lines in radgrid. i just want to copy data from 3rd row column(data displayed in label) to 4th row column(4th row is in edit mode and is RadDateTimePicker control).
I am trying to copy data from label to RadDateTimePicker control when cursor focus on edited column control, copy functionality i need to do this by short cut keys(like Ctrl +K) at client side.