You can use
(row.Cells[1] as DataGridViewComboBoxCell).Value == yourvalue;
and get the selected value as
(row.Cells[1] as DataGridViewComboBoxCell).FormattedValue
To set a default selected value
(row.Cells[1] as DataGridViewComboBoxCell).Value =(row.Cells[1] as DataGridViewComboBoxCell).Items[yourneededindex]
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