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Obviously there is no need to cast, otherwise your original code would not have compiled. Items being updated will be inside a control which is within the Table Cell. This can be beneficial to other community members reading the thread.For example, it depends on the data type, when you edit text you will be a Text Box inside the Table Cell. If it doesn't, put a breakpoint on the line and examine the contents of the Controls property of the Table Cell. Instead, the values will be in Controls inside the Cell. When all you've got is a Hammer, Every Problem looks like a Nail.
I recommend placing a Label on the page and setting it's Text to any error messages instead of using the Windows.
event is raised when a row's Delete button is clicked, but before the Grid View control deletes the row.
This enables you to provide an event-handling method that performs a custom routine, such as canceling the delete operation, whenever this event occurs.
You will need to drill down from the Table Cell to its Controls collection to find the Text Box (there could be more than one child control in the Table Cell) and then you will be able to access the Text property of that. Or just wait, I am sure that someone who uses Web Forms will answer this question shortly. However, since you are using a Data Source ID in .aspx, you will not need to get to the values through Cells.
I am not a Web Forms person so I am just guessing but I think something like string var2 = (Current Row. If you try to use Sql Data Adapter, please remember to remove acceptchanges, this is the problem.