Question

i want to implement undo operation in datagridview which is connected to database

Asked by: srikanth_matti

hi,
   I am currently working in application,I loaded MS_access database into datagridview  using oledb connection there i have written code for insert,delete,update .

For Example: IN Ms Word when we click CTl+Z any previously made changes would be restored.

Just like this any previous changes made in the datagridview should be restored using either button or CTRL+Z keys.

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Asked On
2009-11-01 at 21:52:47ID24862858
Tags

c#

,

datagridview

,

Ms-Access

Topic

C# Builder

Participating Experts
1
Points
250
Comments
2

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Answers

 

by: AkshPosted on 2009-11-01 at 22:37:44ID: 25717431

Hi,

There is no "out of box" functionality available to achieve this.

What you can do is:
1. Create event handler to capture Ctrl+Z key event.
URL: http://support.microsoft.com/kb/839201
http://support.microsoft.com/kb/320584 (More sophisticated approach)

2. In the grid, whenever end-user edits/deletes something, do not do any operation in the database. Instead of that, just mark the data-records with operation-index and operation-type in dataset only. (I am assuming that you are binding the grid with dataset).
2.1 Operation-Index: An integer field in the data-table whose value is in incremental order.
2.2 Operation-Type: A char flag which indicates what had happened to "this" row, i.e. "D" - Delete or "E"-Edit
2.3  Initially set the every index with 0 and operation-type to empty.
2.4  As end-user edits/delete something, increment the index with the previous highest value and set the operation-type flag.
2.4  Now, if user applies ctrl+z, then pick the highest index and replace that row's value from its original value from the database.

3. At the end of the grid, give button like.. "Confirm Change" or something like that... And on the click of that button, save/delete whatever record from the dataset.

I guess, some can also suggest the inner availability of the data-row status. But, anyways still you require the operation-index.

I hope, I sound reasonable on this.

Happy programming,
Aksh
 

20120131-EE-VQP-002

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