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wpf - How to convert DataGrid to dataTable

I want to copy all the datagrid records into datatable without using any loop. For Ex:

Dim dt as New DataTable
dt = Datagrid1.Items

But this is not Working and giving an error message.

My Development platform is Visual studio 2010 and language is WPF with vb.net 4.0

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This is the way to transfer all the records from DATAGRID to DATATABLE without using the LOOP.

VB:

Dim dt As New DataTable
dt = CType(DataGrid1.ItemsSource, DataView).ToTable

C#:

DataTable dt = new DataTable();
dt = ((DataView)DataGrid1.ItemsSource).ToTable();  

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