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Clicking buttons associated with predefined command buttons can result in subsequent, and more specific, events. For example, ItemUpdating and ItemUpdated are fired before and after, respectively, a record is updated. You can use the ItemUpdating event to make any lastminute check on the typed data before this data is sent to the database. Note that before the update is made, ListView checks the validity of any data typed by calling the IsValid method on the Page class. If any validator is defined in the template, it is evaluated at this time.

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I have been given a task to replace text within an existing PDF file. ... I need to find the precise x & y location of the text , and then I could draw the ... Using a template to programmatically create PDFs with C# and iTextSharp .

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because these terms more closely match the keywords used in Visual Basic and C# to implement inheritance. Polymorphism describes the behavior of classes that derive from a common base class. A savings account isn t the only type of bank account. There are also checking accounts, money market accounts, and mutual fund accounts. So Checking, Savings, MoneyMarket, and MutualFund all derive from BankAccount. Polymorphic behavior allows a developer to use a BankAccount variable to refer to any of the derived classes of BankAccount. Polymorphism allows each derived class to handle identical method names with different behavior. For example, both Savings and Checking provide a Withdraw method through inheritance, but the Checking class s Withdraw method deducts a small service charge along with each withdrawal. This chapter concentrates on the mechanics of inheritance. Even with rudimentary techniques, you can develop sophisticated results by inheriting from .NET Framework classes. Later chapters develop other aspects of inheritance, such as base class design, polymorphism, and component development.

In the edit mode user interface, you can have custom buttons too. A custom button differs from a regular Save or Cancel button only in terms of the command name. The command name of a custom button is any name not listed in Table 11-5. Here s an example:

To execute any code in response to the user s clicking on this button, all you can do is add an ItemCommand event handler and check for the proper (custom) command name and react accordingly:

protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e) { // Check the command requested if (e.CommandName == "MyCommand") { ... } }

When the ListView control is used in two-way binding mode, any update operation is conducted through the connected data source control. You define select and save methods on the data source, configure their parameters (either declaratively or programmatically), and delegate to the ListView control all remaining chores.

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c# replace text in pdf

replace string in PDF document (ITextSharp or PdfSharp ) - Stack ...
void VerySimpleReplaceText(string OrigFile, string ResultFile, string origText, string replaceText ) { using (PdfReader reader = new ...