Delete and insert

I am trying to delete everything in my table where yr = now.AddYears(-1)
Then I want to insert into the table information from my textboxes PPrebal.txt and FHPreBal
Here is my code so far but I keep getting object not set to an instance error

Dim i As Integer = 0 Dim month As String = "", PAccrued As Decimal, PUsed As Decimal, FHAccrued As Decimal, FHUsed As Decimal Sqlupdate.SelectCommand = "Select * From PERSONAL where NAME = '" & Session("NAME").ToString & "' YR = '" & Now.ToString("yy") & "'" Dim Load1 As DataView = CType(Sqlupdate.Select(DataSourceSelectArguments.Empty), DataView) If Load1.Count > "0" Then 'Delete Sqlupdate.DeleteCommand = "DELETE FROM PERSONAL where YR = '" & Now.AddYears(-1) & "'" Sqlupdate.Delete() Els ...