Save data from Dynamic Created Gridview to DataBase

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnbackupsheet.Click
       Dim totalcount = CheckBoxList1.Items.Cast(Of ListItem)().Where(Function(item) item.Selected).Count()
       Dim NumberOfGrids As Integer = totalcount
       For i As Integer = 0 To NumberOfGrids - 1
           Dim ds As New DataSet
           ds = Session("query31ds")
           Dim dt1 As New DataTable
           dt1 = ds.Tables(0)
           Dim gv As New GridView()
           gv.AutoGenerateColumns = False
           Dim bf As New BoundField
           bf.HeaderText = "Name"
           bf.DataField = "Name"
           gv.Columns.Add(bf)
           Dim createStartDate As New Date(Now.Year, Now.Month, 1)
           Dim count = dt1.Columns.Count
           For j = 1 To count - 1
               ' Here is template column portion
               Dim TmpCol As New TemplateField()
               Dim date1 As Date
               date1 = createStartDate.AddDays(j - 1).ToShortDateString()
               TmpCol.HeaderText = date1.ToString("dd-MMM")
               TmpCol.ItemTemplate = New TemplateHandler()
               gv.Columns.Add(TmpCol)
           Next
           gv.DataSource = Session("query31ds")
           gv.DataBind()
           GridviewsContainer.Controls.Add(gv)


       Next
   End Sub