Hi, Mike and Torrey,

Thanks for your reply.

 You know that I use the winGrid to display data, and the user can modify the data directly from the cells.

if the user edits the cells' data, there will be a indicator indicates that the data was changed, and I'd like to

use a button named "Apply changes", then if the users clicks this button, all changes were saved to the DataTable

or other DataSource.

Thank you very much!

Okay... you caught me. I admit it. I'm really a bot. :)

By default, the UpdateMode property of the grid is set to commit changes when the grid loses focus. So if you click on a button on the form, the grid will automatically save the changes to the data source - you don't have to do anything. 

If this is a toolbar button, instead of a regular button, then it probably does not take focus. Therefore the grid would not lose focus, so no update will take place. In that case, you would call the grid.UpdateData method to commit the changes. 

Hi, Mike,

Thank you for your reply. please see 2 solutions below:

1. this.ultraGrid1.DataSource = dt; here dt is a DataTable, suppose there are 2 buttons, "Apply changes" and "Discard changes",

when the "Apply changes" button is clicked, I call "dt.AcceptChanges();",then the changes are saved to the dt; if I click

"Discard changes",  I call "dt.RejectChanges();",then all the changes are discarded, and the ultraGrid displays its original data.

That works well.

2.  Otherwise, if I set this.ultraGrid1.DataSource = this.ultraDataSource1, then use the "CellDataRequested" event to load data OnDemand from some other datasource, I set the UpdateMode

to Infragistics.Win.UltraWinGrid.UpdateMode.OnUpdate, and in the "ultraGrid1_BeforeRowUpdate" event, I set e.Cancel = true,

when I click the "Discard changes" button, I call "this.ultraGrid1.UpdateData()", then the "ultraGrid1_BeforeRowUpdate" event is fired

specified times according to how many rows were updated. but at last, I can only see the last row's data is reverted on the grid, not all

the rows, why? or I missed something?

Meanwhile, Are there some demos by using the "CellDataRequested" event, and show how to discard or save all changes?

Thank you very much!

Was there a resolution to this

Mike,

thank you, I have done that.

Hi, Mike,

Thank you!

Now I know the UltraDataSource can't do it for me, so I revert a cell's value by reading its original value from

the latest saved datasource, and it works for me.

By the way, I encounter with a Exception when I set:

this.ultraGrid1.DisplayLayout.Override.AllowMultiCellOperations = AllowMultiCellOperation.All;

this.ultraGrid1.DisplayLayout.Override.CellClickAction = CellClickAction.CellSelect;

to do cut/copy/paste, here is a column's type is double(Currency), and I set its format to "C" and so forth, for example,

at last, a number 1000000.69 will display as $1,000,000.69, if I copy this cell to another cell in the same column,

an error said "can't convert $1,000,000.69 to double". If I don't use this format, it works, but how can I do this with

using this format?

Thanks

I'm afraid you lost me.

Why are you setting the UpdateMode on OnUpdate? This setting actually does not work, because the BindingManager implicitly calls an update when it changes it's Current position. 

And why are you cancelling BeforeRowUpdate? 

And why are you calling UpdateData when the user clicks the Discard Changes button? That seems to be backwards.

A DataTable is specifically designer to be used with a database. So it has all kinds of functionality to deal with keeping track of which rows have changed so that it can cancel the changes or update the back end. UltraDataSource is designed to be a much simpler and fast data source and it has no such functionality. So if you want to be able to discard all changes made to all rows in the grid, you will have to implement some way to store the original values and do this yourself - the UltraDataSource cannot do this for you.