How can we add record using dataset and add record from gridview coloumn using vb.net

 Dim idcoloumn As New DataColumn
    Dim id1coloumn As New DataColumn
    Dim dt As New DataTable

    Dim dr As DataRow
    Dim dr1 As DataRow




  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
   

        idcoloumn = New DataColumn("id", Type.GetType("System.Int32"))
        id1coloumn = New DataColumn("id1", Type.GetType("System.String"))
        dt.Columns.Add(idcoloumn)
        dt.Columns.Add(id1coloumn)
        dr = dt.NewRow()

        dr = dt.NewRow()
        dr("id") = 12
        dr("id1") = 12

    
        dr1 = dt.NewRow()
        dr1("id") = 13
        dr1("id1") = 13
        dt.Rows.Add(dr1)
        DataGridView1.DataSource = dt
 Return
 End Sub


  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim i As Integer
        Dim j As Integer
        Dim p As Integer
        'Dim temp As Integer
        Dim ds As New DataSet
        i = 0
        For p = 0 To dt.Rows.Count - 1
            'Next
            i = i + dt.Rows(p)("id")
            'j = ds.Tables(0).Rows(0).Item("id1").ToString()
            'temp = i + j

        Next p
        TextBox1.Text = i.ToString()

    End Sub
End Class