How to retrieve cell value by position for a table binded to MS Access?

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WPF

In Excel VBA, I can use Sheets("WorkSheet Name").Cells(Rownumber, ColumnNumber).value to get a value at the location specified by Rownumber and ColumnNumber.

But how to do this in WPF, Visual Studio 2010 Express environment where textbox value of Mainwindow.xaml need to refer to cell value of specific cells in the table stored as datagridview in a form?