C control validating event
Here, we set the Data Source of the Grid View to Sql Data Source1. We also enable paging, sorting and editing features of the Grid View.By default when the Grid View controls goes in edit mode, it displays Text Boxes for entering values.On the next step select Customer ID, Company Name, Contact Name and Country columns (Figure 2).
If the Validating event is not canceled, the dialog will get notified with the Validated event: Since each control has Causes Validation set to true by default, to allow the user to cancel the dialog without entering valid data, make sure to set the Causes Validation property to false for your Cancel or Close button: As much as I lean on the message box in my test development, I prefer not to use it for actual applications.
We also discuss the different user input validation techniques and cover how to use the Error Provider component to display error messages.
When an application encounters an unexpected situation such as a missing file or input parameter, or a logical error such as performing a division by zero, the application generates exceptions.
A yogic approach to success, happiness, and inner transformation. However, most of the real world cases call for validating the data being edited or deleted. Drag and drop an SQL Data Source control on the web form.
A powerful sequence of Mantra, Pranayama, Hand Mudras and Meditation. There can be several approaches taken for validating data. For our example we are going to use Customers table of Northwind database. Open its smart tag and choose "Configure Data Source" option to start Configure Data Source wizard.
For example, you may want to prevent alpha characters from being input to a field which requires a telephone number.