SET Geo = NULL WHERE Geo not NULL"; cmd.ExecuteNonQuery(); cmd.CommandText = "

SET Geo = NULL WHERE Geo IS NOT NULL"; cmd.ExecuteNonQuery(); cmd.CommandText = "UPDATE [Sheet3

SET Area = NULL WHERE Area IS NOT NULL" ; cmd.ExecuteNonQuery(); cmd.CommandText = "

SET Area = NULL WHERE Area IS NOT NULL"; cmd.ExecuteNonQuery(); cmd.CommandText = "UPDATE [Sheet3

SET Region = NULL WHERE Region IS NOT NULL" ; cmd.ExecuteNonQuery(); cmd.CommandText = "

SET Region = NULL WHERE Region IS NOT NULL"; cmd.ExecuteNonQuery(); cmd.CommandText = "UPDATE [Sheet3