私は次のコードを試しました:
OleDbConnection My_Connection = new OleDbConnection("Provider=Microsoft.Jet...
My_Connection.Open();
string sql = " UPDATE Rooms SET [Room Status] = 'Taken', [Available] = 'No' WHERE [RoomNumber] = " + textBox5.Text;
OleDbCommand My_Command = new OleDbCommand(sql, My_Connection);
My_Command.ExecuteNonQuery();
My_Connection.Close();
エラーは次のとおりです。条件式のデータ型の不一致