How to set datatable items into wpf datagrid cells ?

Hi,

   In my application i have one datagrid with binding fields like below screenshot.

and i have one datatable  with data from database.

now i want to bind above 2 datatable items to datagrid into a specific cells.

for this i tried blow code

((ProductDetails)dgvitemdetails.Items[0]).pitemCode = dtProdItems.Rows[0]["PROD_CODE"].ToString();

but i am getting below error

"Operation is not valid while ItemCollection has no inner collection. ItemCollection is uninitialized or binding on ItemsControl. ItemSource supplied null for collection."

Please guide me where i did the mistake.

Thanking You, Nagendra.