How to Populate a DatagridComboBox Column from another column

Hi all,

I have two tables named Table1 and Table2. I want to Populate the column Col1 of Table1  with Col2 of Table2. here Col2 is a source column and  all values of Col1 will be a subset of Col2. And I need the ComboBoxColumn to show only values which is not present in Col1 and present in Col2 

Regards

Iqbal

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