@clarifier Well, it's calling the code behind method every time. However you should pay attention to the implementation of the method. In my approach, you can leave the commandfield as is, then you can hide it as needed via code behind.
If it is expensive, this could easily sum up to a large cost. In this example, I am hiding it if the field "Scenario" of the grid shows the text "Actual" for the relevant row of the Row Data Bound event.
So In the Template Column child grid with edit and delete option will get visible.
The idea is to only allow a command to be performed on specific people. I'd prefer a declarative solution to a procedural one. For me converting the commandfield to a templatefield control is not an option, as the commandfield comes with built-in functionality that I would otherwise have to create myself, for example the fact that it changes to "Update Cancel" when Edit is clicked, and that when Edit is clicked, all the cells in the row which are labels become textboxes, etc.
Six of those paramaters basically comes from the Text Box values that were entered in the page. Invalid Cast Exception: Unable to cast object of type 'System.
The last parameter is a boolean value which tells the method whether to execute an Insert (false) or Update (true). In-order to perform Edit and Update in Grid View we need to use three events ( Grid View_Row Editing, Grid View_Row Canceling Edit , Grid View_Row Updating).
When updating a database with changes from a Data Set in previous versions of ADO. Therefore, only one event fire for the next row, until all of the rows are processed.
Net 2.0's Grid View Control than the Data Grid Control in ASP. As I had worked with Data Grid Control so I knew how difficult to work with it in same project. The main difference between Data Grid and Grid View control is that the first one has central event handling which means any event raised by control inside the Data Grid's template column will be handled by Item Command event of datagrid.
But this functionality is some what different in Grid View Control. I mean to say that in Grid View Control if you have added one template column having Grid View inside it and now if you select "Column Sorting" command then it will not call any event of Master grid.
Had we used the 'Register Client Script Block', the browser would have executed the Java Script before the text box is on the page.
Therefore, the Java Script would not have been able to find a ‘txt Master’ and would give a control not found error.