Skip to main content

DataSet: More reasons to not like it

So I am still living in the world of DataSets, when will I ever learn?

The task was simple, take the contents of DataSetA and merge it into DataSetB. Sure, just use:

DataSetA.Merge(DataSetB, true)

and life will be good. But wait! Why is it when I try to save the merged data from DataSetB to the database it doesn't show up?

Because the RowState of all the rows in all the tables are set to Unchanged! And a merge operation does not change the RowState. So if I want all the data from B to be saved to A I have to change all the row states of all the tables to Added. Sure, I should be able to loop thorough it all and set the row's state as such:

row.RowState = DataRowState.Added;

Not so fast grasshopper! row.RowState does not have a setter! Isn't that Asinine! You have to use:


What ever, I say setter, you say method. Long story short I created an extension method that works.

public static DataSet MergerAllDataAsNew(this DataSet target, DataSet source)
foreach (DataTable table in source.Tables)
foreach (DataRow row in table.Rows)

target.Merge(source, true);

return target;

Brute Force works.


Popular posts from this blog

Json for jqGrid from ASP.Net MVC

jqGrid takes a specific format for its json (taken from jqGrid documentation): [js]{ total: "xxx",page: "yyy", records: "zzz", rows : [ {id:"1", cell:["cell11", "cell12", "cell13"]}, {id:"2", cell:["cell21", "cell22", "cell23"]}, ... ]}[/js] The tags mean the following: total - Total number of Pages. page - Current page Index. records - Total number of records in the rows group. rows - An array with the data plus an identifier. id - The unique row identifier, needs to be an int from what I have found. cell - An array of the data for the grid. The ASP.Net MVC framework has the JsonResult response type which we can use to populate the jqGrid. As an example I created a Person model and a method to return some data: [csharp] public class Person { public int ID { get; set; } public string Name { get; set; } public DateTime Birthday { get; set; } } public I

Remote Controlled RoboTank

This is my version of the ever popular to build RoboTank. It uses an Arduino Mega 2560 with the AdaFruit motor shield and an XBee S1 to communicate to the DFRobot Gamepad. The sketch for the RoboTank makes use of the AFMotor.h to drive the motors and includes a serial parser to read and process the commands coming from the Gamepad. DFRobot Wireless Joystick

Changing Typed DataSet Connection String

I was working on a WinForm app that connected to a MS Access database. Yeah, Access sucks but I didn't have a choice in the matter. The app itself is used to import a bunch of CSV files into the Access database. It is more of a utility program and it has going through several variations, from being a simple hand driven command line tool to being GUI driven. The command line version was all hand controlled. I had to go in and update configuration files to point to the CSV files and the MDB database. That got old fast so I decided to make a GUI version that would allow me to pick the MDB file and each of the CSV files to import. Picking and using the CSV files was easy, it was changing the connection string for the MDB that proved to be the hardest. I am using strongly typed datasets in VS2005. If you have ever worked with them you find out soon that the connection string gets saved with the project in the app.config file, even if it is a seperate DAL dll project. My guess is