Auto saving datagridview rows to a sql server database – codeproject

SQL Enterprise Manager did it since years: Whenever a user changes a row in a table, it is automatically written back to the database table. Database join types Providing our users with the same functionality is tricky to implement because of the interaction of DataSet and BindingSource, which is hardly documented in the .NET help. Section 8 database This article investigates some intuitive solutions and explains why they will not work. Icd 9 database A detailed analysis of the involved events leads to the final solution, which is surprisingly simple as any good solution should be. Database xampp Background

Often, a user has to save his work explicitly, like saving a document in Word. Database administrator jobs This approach works right out of the box with DataRowViews, using the save button of the BindingNavigator. Data recovery joondalup But saving explicitly can be cumbersome for the user if changes in a DataRow should be updated immediately to the database.

Database of genomic variants Implementing auto saving should be easy! Just use an event which detects that the row content has changed, use the Update method of the TableAdapter and you are done. Database viewer Unfortunately, ADO.NET will run into some strange internal errors should you try it.

The DataGridView would be the most obvious choice to detect that a row has changed in the DataGridView. H data recovery registration code free download But the DataGridView focuses mostly on a cell, displaying its content, the user interaction and writing back the changed data to DatSet.DataTable.DataRow. Database hardware Events like DataGridView_RowValidated fire for all possible reasons, and not necessarily because the user has changed the data.

There would be the DataGridView_CellEndEdit event indicating a change. Database roles But using TableAdapter.Update() at this point of time will mess up ADO.NET. B tree database management system Updating the database would happen in the middle of copying from the DataView to the DataTable. Database file Both activities change the state of the DataRow. Data recovery near me Interrupting the copy with the update will prevent the copy operation from finishing properly (I guess ADO.NET doesn’t support reentrancy). Database job description BindingSource event

The data binding for the DataGridView is done in the BindingSource, the right place to detect when the content of a cell has changed: private void BindingSource_CurrentItemChanged(

If you try this code, it will work, alas for the first changed record only! You will get a strange error message during the update of the second row, basically the row seems to be empty. Data recovery 94fbr When you check with the debugger, the row has meaningful data before the update and only after the runtime error it seems to be empty. Database foreign key The update even writes the second record successfully into the database. Database as a service DataTable event

If the BidingSource doesn’t work, how about using an event from the DataSet.DataTable? After all, any change to the DataRow should be written to the database, regardless of who does it. Iphone 6 data recovery The code could look like this: void Table_RowChanged

This time, you will immediately get a run time error. Database google drive ADO.NET has not yet finished changing the DataRow when the Update tries to change the state of the DataRow again. Data recovery geek squad The solution

It seems that ADO.NET doesn’t want to be interrupted by a row update to the database until is has completely copied the changes from the DatRowView to the DataTable. Database recovery pending None of the row change related events can be used to save the row to the database. Data recovery prices So the solution must be to use an event which fires after the row is copied and the event should not be related to the row changed! Well, then let’s just use the PositionChanged event of the BindingSource. Database sharding It fires for the next row the user navigates to. Database keys with example So the challenge is to remember which was the last row, check if it was modified and update the database if needed. Data recovery xfs Don’t forget to do the same thing when the Form closes, the PositionChanged event will not fire when the Form closes: public partial class MainForm: Form {

// we need to avoid to write a datarow to the // database when it is still processed. Database management systems 3rd edition Otherwise // we get a problem with the event handling of // the DataTable. Database engineer salary throw new ApplicationException( ” It seems the” +

Before you can run the sample application, open the Solution Explorer to change the NorthwindConnectionString. Jstor database The DataSource should point to your SQL server with the Northwind database.

Once the application is running, change the name of a region and move to another row. E m database This will save the region name to the database. Data recovery richmond va Check in the database or close and restart the application to see if the change is really stored. Data recovery software Don’t forget to change the region name back to its original value. Data recovery advisor Conclusion

The same problem existed in earlier ADO.NET versions. Database host name I didn’t try it, but the described approach should also work for earlier versions, just use the events of the CurrencyManager. Database performance History

Besides updating the existing rows, I have the requirement of adding new rows to the DataGridViews User Interface which internally gets added to the underlying datasource.

The exception is that “Required values are not supplied to the new DataRow” which are the composite primary key columns (2) and “not null” columns (3).

I have a created the auto saving function, everything appears to be working correctly however when i view the contents of the database table the changes have not be replciated to the database file. Data recovery broken hard drive I have coded a VB version and checked it against the C# example and they appear to be the same – i have included my code below.

Private Sub ServicesBindingSource_PositionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ServicesBindingSource.PositionChanged

I spent several hours yesterday struggling with how to do this. Database xe I saw the problems with handling several of the events mentioned above and in the comments before I ran across this article, but this article gave me the solution. Database yml mysql Thanks!

In my application, I’ve got a number of DataGridViews that each need to be udpated. 5 database is locked So I made a helper class, GridDataUpdater, to encapsulate the update functions.

To use it, you have to create a new instance of GridDataUpdater for each bound DataGridView. Database fundamentals Then you tell that instance which TableAdapter update command to use when it updates the row of data, and also assign its two event handlers to the BindingSource’s PositionChanged event and the DataGridView’s Leave event: