wpf - How to convert DataGrid to dataTable -


I want to copy all the datagrid archives into datatates without using any loop. For X: 

  New Datatable DT = Data Grid 1. DMTT as the item   
 but it is not working and is giving an error message.  
 My development platform is Visual Studio 2010 and language is with WPB vb.net 4.0   
 
 
 How to transfer all records from DATAGRID to datasheet without using LOOP  
  VB:   
  DMTT as new Datatelle DT (DataGrid1.ItemsSource, DataView) .toTable   
 Dt = (DataView) DataGrid1.ItemsSource .toTable ();

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