ช่วยทีครับ...จะ วนลูปเอาข้อมูลใน DatagridView ทั้งหมดลงในฐานข้อมูล ต้องทำไงครับ (เคยใช้แต่ ListView)

Imports System.Data
Imports System.Data.SqlClient
Imports Excel = Microsoft.Office.Interop.Excel


Public Class Form3

    Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim cnn As SqlConnection
        Dim connectionString As String
        Dim sql As String

        connectionString = "server = BEX-NB0020;database =db_checksa_sa;Trusted_Connection = yes"
        cnn = New SqlConnection(connectionString)
        cnn.Open()
        sql = "SELECT * FROM SA_Doubly"
        sql &= " Order by ID_SA asc"
        Dim dscmd As New SqlDataAdapter(sql, cnn)
        Dim ds As New DataSet
        dscmd.Fill(ds)
        DataGridView1.DataSource = ds.Tables(0)
        cnn.Close()

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim xlApp As Excel.Application
        Dim xlWorkBook As Excel.Workbook
        Dim xlWorkSheet As Excel.Worksheet
        Dim misValue As Object = System.Reflection.Missing.Value
        Dim i As Integer
        Dim j As Integer

        xlApp = New Excel.ApplicationClass
        xlWorkBook = xlApp.Workbooks.Add(misValue)
        xlWorkSheet = xlWorkBook.Sheets("sheet1")

        For i = 0 To DataGridView1.RowCount - 2
            For j = 0 To DataGridView1.ColumnCount - 1
                xlWorkSheet.Cells(i + 1, j + 1) = _
                    DataGridView1(j, i).Value.ToString()
            Next
        Next

        xlWorkSheet.SaveAs("C:\vbexcel.xlsx")
        xlWorkBook.Close()
        xlApp.Quit()

        releaseObject(xlApp)
        releaseObject(xlWorkBook)
        releaseObject(xlWorkSheet)

        MsgBox("You can find the file C:\vbexcel.xlsx")

    End Sub

    Private Sub releaseObject(ByVal obj As Object)
        Try
            System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
            obj = Nothing
        Catch ex As Exception
            obj = Nothing
        Finally
            GC.Collect()
        End Try
    End Sub

End Class