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You should find a balance between getting usable validated data in the database and user experience etc.
I also recommend you ALSO use client side validation in the form of validators.
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.
On the first step of the wizard click on "New Connection" button to open a dialog as shown in Figure 1.
I want to add a required field validator and custom field validator for the metrics field that checks if the field is empty and is numeric only...5 or 10.5, etc.
Now to decide where to set this group validation is the event where the binding of the grid happens.
The binding of the grid happens on the Row Data Bound Event, that is why we assign a validation group to the controls present in each row inside in the Row Data Bound event.
Register For Event Validation method in order to register the postback or callback data for validation.
" I had the same problem with validating controls in a gridview.