Need Help With Updating A Gridview From Code-behind

Hi,

I've got a gridview that displays some (but not all) columns from a sql database table. One of the columns that is NOT displayed is the table's primary key column. I'm putting together this row updating sub based on an article I found on the 'Net. Here's the code I've added for the GridView's edit routine (based on the article):Protected Sub gvPersonnelType_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles gvPersonnelType.RowEditing
gvPersonnelType.EditIndex = e.NewEditIndex
gvPersonnelTypeBindData()
End Sub

Protected Sub gvPersonnelType_RowCancellingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs)
gvPersonnelType.EditIndex = -1
gvPersonnelTypeBindData()
End Sub

Protected Sub gvPersonnelType_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
'Dim PersonnelTypeID As Integer'This is not displayed in the gridview, but is the primary key in the database
Dim LaborForceTypeID As Integer
Dim DefaultPayRate, DefaultPieceRate, Rebill As Decimal'These are money datatype in the database
Dim DefaultAdminCostPercent, MarkUp As Double 'These are float datatype in the database'Don't know if the following lines properly "capture" the values in the textboxes
LaborForceTypeID = Integer.Parse(gvPersonnelType.Rows(e.RowIndex).Cells(0).Text)
DefaultPayRate = CType(gvPersonnelType.Rows(e.RowIndex).Cells(1).Controls(0), TextBox).Text
DefaultPieceRate = CType(gvPersonnelType.Rows(e.RowIndex).Cells(2).Controls(0), TextBox).Text
DefaultAdminCostPercent = CType(gvPersonnelType.Rows(e.RowIndex).Cells(3).Controls(0), TextBox).Text
Rebill = CType(gvPersonnelType.Rows(e.RowIndex).Cells(4).Controls(0), TextBox).Text
MarkUp = CType(gvPersonnelType.Rows(e.RowIndex).Cells(5).Controls(0), TextBox).Text

Dim gvSqlConn = New SqlConnection("DATABASECONNECTION")

gvSqlConn.open()
Dim UpdatePersonnelTypeCmd As New SqlCommand("UPDATE rsrc_PersonnelType SET LaborForceTypeID = @LaborForceTypeID, " & _
"DefaultPayRate = @DefaultPayRate, DefaultPieceRate = @DefaultPieceRate, " & _
"DefaultAdminCostPercent = @DefaultAdminCostPercent, Rebill = @Rebill, Markup = @Markup", gvSqlConn)

'Sql doesn't know what row to update: NEED WHERE STATEMENT!!!

UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@LaborForceTypeID", LaborForceTypeID))
UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@DefaultPayRate", DefaultPayRate))
UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@DefaultPieceRate", DefaultPieceRate))
UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@DefaultAdminCostPercent", DefaultAdminCostPercent))
UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@Rebill", Rebill))
UpdatePersonnelTypeCmd.Parameters.Add(New SqlParameter("@Markup", MarkUp))

UpdatePersonnelTypeCmd.ExecuteNonQuery()
gvSqlConn.close()

gvPersonnelType.EditIndex = -1
gvPersonnelTypeBindData()

End Sub

 As you can see, I've added some notes in the RowUpdating sub. I don't understand how to use the PersonnelTypeID (the database table's primary key) for the WHERE clause to update the correct row in the database.

As for the GridView itself, it's populated from the code-behind as well (as you can see from the call to "gvPersonnelTypeBindData()") and the SELECT statement used to populate the gridview doesn't use the PersonnelTypeID column either.

I'd appreciate it if someone could point me in the right direction to get this RowUpdating sub working.

Thanks!