DataGridColumn с заголовком "<var>X</var>" уже существует в коллекции столбцов DataGrid. DataGrid не может иметь общие столбцы и не может содержать экземпляры-дубликаты столбцов.

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DataGridColumn with Header '<var>X</var>' already exists in the Columns collection of a DataGrid. DataGrids cannot share columns and cannot contain duplicate column instances.

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