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This is the scenario (Delphi XE2 32 bit, I have attached a small text file that contains code snippets related to this question): - One Access database (single table) used with a TADOQuery - All records are SELECTed with a very simple SQL statement - A Quantumgrid with three views, but for the moment we can concentrate on the first view only that is very plain vanilla The cell layout is: - One unbound checkbox (Greyed not allowed) inserted as the first cell and as explained in one of the questions found here - The checkboxes are all set to checked at startup (see attached code) - The datacontroller of this view has Immediate Post = True and also the checkbox has Immediate Post = True since I want that the state changes with only one mouse click. It works without problems and I can check and uncheck rows just as I wanted.Datasets store a copy of data from the database tables.The first argument to Fill function is the Data Set name which we want to populate. In this way, we can use a dataset for storing data from many database tables.Until now, we only focused on reading data by using Data Set and Data Adapter class.Everything is working properly except for when I update the data set. I have checked the Categories class and there is no method that looks remotely close to the Find By Category ID method. Thanks Hi, Can you verify if the Category ID is the primary column in your database table? One option is to set the primary column in the table and regenerate the dataset. Update(data Set11); The error I recieved was as follows: Invalid Operation Exception: Update requires a valid Update Command when passed Data Row collection with modified rows I was able to fix it by adding the following line before the Update command: System.
And the gridview's datasource is a dataset I populated from my database.
For the moment I am interested only in the Quantumgrid.
Anyway I have to say that the learning curve is very steep.
However, Datasets can not directly retrieve data from Databases.
Data Adapters are used to link Databases with Data Sets.
As you know, there are frequent modifications in database tables in real life.