title: Calculate SUM of "Amount" column in DATAGRID's DataGridTemplateColumn on in WPF
body: <p>We have WPF application, In which we use DataGrid on one form.
  Now we want to calculate total of "AMOUNT" column of that datagrid on Winddow_Loaded event, So can it will display total of AMOUNT column in one TextBox
  when Form get loaded. So how to iterate through all rows in DATAGRID &amp; Calculate Total of "AMOUNT" column.</p>
  
  <p>How to show this total in Footer of WPF Datagrid.?</p>