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This is most common in classes where you are using class-wide instantiated objects.
If you create and drop your objects within each method, this isn’t going to be a problem, and you are actually following a better guideline by creating at the last necessary moment, and destroying at the first possible moment, not to mention avoiding possible exceptions like Invalid Reference Exception.
In this article we will look at using the Grid View control to update data, although the Data List, Details View, and Form View controls are also suitable choices.
The Grid View control makes displaying, editing, and deleting data as easy as pointing and clicking.
Once they've selected this record, you need to show it's existing values in editable fields (textboxes, cehckboxes, and so on), let the user make any modifications, and then save them.
We can easily create the Web controls necessary to facilitate an editing interface and it is simple enough to use a Sql Data Source control with appropriate Update Parameters to execute the appropriate statement with values based on the Web controls' values.
These controls allow page developers to declaratively access and modify data without writing any code to perform the data access. In this article we will examine basics of using the Sql Data Source and Grid View controls to update records from a database.Future installments will explore more advanced updating scenarios, such as customizing the Grid View's editing interface and programmatically setting the updated values. The UPDATE Table Name SET Column Name1 = @Parameter Value1 Column Name2 = @Parameter Value2 ...Column Name N = @Parameter Value N WHERE Primary Key Column Name1 = @Primary Key Value To Update1 AND Primary Key Column Name2 = @Primary Key Value To Update2 AND ...Again, same exception gets thrown, but coming from withing the instantiated class itself.The Get Orders function inside of Customers requires an instance of a connection, but you disposed of the required objects required to access the database back up in Load Data() when you called a. Be careful when you clean up your instances, that you are not using them again somewhere.