How to merge data with DataGrid ItemSource in WPF

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WPF

DataGrid

I have one scenario in which i have two forms one contain DataGrid for Master and on double click that will open child form which allow me to make any changes, the issue is when i update the child information i have to update same related information on my Master DataGrid.

For your information, I am using C#.

I have try following to reflect the changes.

DataTable _MyTable;

_MyTable.PrimaryKey = new DataColumn[] { _MyTable.Columns["Id"] };
((DataView)dgListing.ItemsSource).ToTable().Merge(_MyTable);
((DataView)dgListing.ItemsSource).ToTable().AcceptChanges();

dgListing.Items.Refresh();

but above code not help me anyway.

_MyTable fetch the updated record from Database.
dgListing is My DataGrid
I have fill my DataGrid as follows at the time of Master Form Load

dt.PrimaryKey = new DataColumn[] { dt.Columns["Id"] };
dgListing.ItemsSource = dt.DefaultView;

Thanks and Regards,