Handle errors when databinding a query parameter to a datasource?

Question

How can I handle errors when I use databinding to databind a query parameter to a datasource control?

I have 3 questions:

1. How can I validate that the query string data is correct before it is bound to the datasource?

2. How can I handle errors when the data is in the correct form but an error is generated from the database?

3. Is it safe to databind directly to the query parameter?

If I remember in the DataGrid there was an OnError type of construct I used in the past.