Updatepanel hidden field not updating

If in another situation, where there are only 2 update panels, and one will set off another one, then “Always” should be applied.One good example would be that there is a modal form for adding a new record which is in one update panel, and in another update panel there is a search grid which displays all records, both has the value of always set in the value, this will cause an refresh in the search grid update panel, which updates the grid with the new value.Everything is straightforward and no different from using controls inherited from - in this case no 'OK/Cancel' buttons are displayed in the bottom of the drop down box, no postback occurs when a user clicks outside control and drop down gets hidden.

It has same events (in fact only one is of interest - On Selected Index Changed) and members (except those relevant to new rendering and client side behavior).The grid it self is placed in one update panel, on every row in the grid, a ids to the details update panel as triggers, and it would be too inefficient.So this is the perfect example to execute the update in the code behind.The code behind method can be applied for more than 2 update panels on the page, but only one update panel wants to be refreshed by another update panel’s update.In one example, there is a grid display a list of vehicles, on the right side of the grid, we want to display the details of the vehicle when a person clicks an item in the grid, but we want to do this so the page does not refresh.

Updatepanel hidden field not updating