ISData Adapter Code:

    public class CustomersISDataAdapter
    {
        public CustomersISDataAdapter()
        {
        }
        private Customers _lastCustomers = null;
        public CustomersISDataCollection GetData(string sortExpression, int maximumRows, int startRowIndex)
        {
            Customers items = Customers.GetCustomers(startRowIndex, maximumRows);
            this._lastCustomers = items;
            CustomersISDataCollection dataCollection = CustomersISDataCollection.CreateISDataCollection(items);
            return dataCollection;
        }
        public int SelectCount(string sortExpression)
        {
            return this._lastCustomers.MaxRowIndex;
        }
    }

For some reason the GetData method is always called twice.

It's called twice when the page loads and twice everytime I page.

No grid events are being handled in the code behind.

I have two questions:



1) How can I stop the GetData call being made twice.

2) Why does the return object of GetData need to inherit IHierarchicalList. I can do theGrid.DataSource = theCustomers, where theCustomers is of type CUstomers, and it works fine...but returning a Customers object gives an error when using the ISDataSource saying the collection must implement IHierarchicalList. This means I have to take my customer objects and add them to a special collection before I return them.

cheers,

Steve