"  Are you raising the PropertyChagned event for that property when it changes.."

By this do you mean when the SelectionChanged occurs for that combo?

If i use the e.Cell.Row.Data then it shows the existing value in the xamgrid or data in db

How can I retrieve the value that user is trying to enter

The vent is triggered fine its just the value that it checks is against old value, it if uses the new value code would work just fine

You're looking at the Columns collection on the Column, which would only contain children columns of that Column, for example if e.cell.Column was a GroupColumn; 

Also, you're trying to apply a style to an entire column, which i don't think you want to do. You'd just like to apply it to a cell in the same row, right?

So it should be something like:

e.Cell.Row.Cells["field2"].CellStyle = ....

Also, don't set the e.IsDirty flag. As thats only neccessry if you mess with the e.Cell.Control that is being attached in the event. 

-SteveZ

I am doing something like

xxx data = e.Cell.Row.Data as xxx;

 if ((data.field1!= 1 && data.field1!= 2))
                    {

                        e.Cell.Column.AllColumns["field2"].CellStyle = Application.Current.Resources["mystyle"] as Style;
                        e.IsDirty = true;

                    }

But AllColumns count is always 0

If I check the column key then it doe snot identify the value of other column

Any ideas?

So, the CellControlAttached event will be raised for the combo then. 

You could then detect if the combo column is changing (as thats the one determining whether the other cell should be enabled/disabled) and you can set the style on that particular cell. 

-SteveZ

The propertyChangedEvent is raised