Which Event Should I Use to Add a Row to an Infragistics UltraWebGrid?

Question

I'm using Infragistics Ultrawebgrid in my application

I have a button called validate:: i need to add new rows to the Ultrawebgrid using <> and when the 'validate' button is clicked i need to perform some validations based on the data entered.

in Which event in can incorporate the code.

Right now i have events like::

**protected void validateButton_Click(object sender, EventArgs e)**

*protected void UltraWebGrid1_AddRow(object sender, RowEventArgs e)*

*protected void UltraWebGrid1_UpdateRow(object sender, RowEventArgs e)*

in which event should i insert code for adding new rows and how /where shall i retrieve the data(entered in the Grid) to validate<>