Mass Insert from a datatable to a database

I have a typed dataset set that I fill by scrapping an HTML page, and getting the information I need.

I fill my datatable with 600 odd rows, then call my dataadapter to update the Database. The problem is that it adds the first row, but not any other of the rows. I get this error message

"Column 'PriceID' is constrained to be unique. Value '6' is already present." The row that is added to the database is given the PriceID of 6.

The PriceID field is the primary key, Autoincrement field on a SQL Server database. My typed dataset is auto generated by VB.Net and I've not had problems with the mass inserts of data in the passed.

VB Code:

Dim dt As ds.PricesDataTable = ds.Ds1.Prices
        For Each cp In HS.Prices
 
             Dim dr As ds.PricesRow = dt.NewPricesRow
             dr.ProductID = cp.ProductID
             dr.CurrentPrice = cp.Price
             dr.UpdateTime = CDate(Format(Now, "dd/MM/yyyy"))
             dt.Rows.Add(dr)
        Next
 
        Try
            ds.PricesDA.Update(ds.Ds1.Prices)
        Catch ex As Exception
            Debug.WriteLine(ex.Message)
        End Try

When I alter the code to update to the database one row at a time as below.

VB Code:

Dim dt As ds.PricesDataTable = ds.Ds1.Prices
        For Each cp In HS.Prices
 
             Dim dr As ds.PricesRow = dt.NewPricesRow
             dr.ProductID = cp.ProductID
             dr.CurrentPrice = cp.Price
             dr.UpdateTime = CDate(Format(Now, "dd/MM/yyyy"))
             dt.Rows.Add(dr)
 
             Try
                  ds.PricesDA.Update(ds.Ds1.Prices)
             Catch ex As Exception
                  Debug.WriteLine(ex.Message)
             End Try
        Next

it works. This is not acceptable as this is inefficient. ADO.NET is supposed to allow bulk inserts.