SelectionMode элемента управления DataGridView не может принимать значение <var>X</var>, пока в нем есть столбец, SortMode которого имеет значение DataGridViewColumnSortMode.Automatic.

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DataGridView control's SelectionMode cannot be set to <var>X</var> while it has a column with SortMode set to DataGridViewColumnSortMode.Automatic.

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