How to get value from unknown object where property is known?

Hi. I need to get values from DataGrid without knowing the itemssource BUT I do know DataGridColumns sortmemberPaths.

So I would like something like: var row1Col1Value = myDataGrid.Items[0].Where(r=>r.property == myDataGridColumn1.SortmemberPath).Select(r=>r.Value).Single();

For example lets assume that DataGrid.Itemssource = List<Contract>(); AND first column.sortmemberpath = "Customer.Name"