[.net]ลบคอลัมแล้ว datagrid ไม่ยอม refresh ต้องทำยังไงครับ

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try
            OwnerTableAdapter.Insert(txtID.Text, txtOwName.Text, cBoxOwGend.SelectedItem, dateOwBirth.Value.Date, "", txtOwnerPass.Text)
            OwnerTableAdapter.Fill(DataPetDataSet.Owner)
        Catch ex As Exception
            MessageBox.Show(ex.Message, "กรุณาตรวจสอบข้อมูล คุณอาจจะป้อนข้อมูลลผิด")
        End Try
        txtOwName.Text = ""
        cBoxOwGend.Text = ""
        dateOwBirth.Value = Now
        txtOwSplen.Text = ""
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        '--delete จาก IDowner 
        If MessageBox.Show("Are you sure to delete?", "Confirm.", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) = Windows.Forms.DialogResult.Yes Then
            Dim strConnection As String = "Data Source=YYY;Initial Catalog=dataPet;Persist Security Info=True;User ID=sa;Password=123"
            Dim IdDelete As String
            IdDelete = txtID.Text
            Dim strSQL As String = "DELETE FROM Owner WHERE OwnerID='" & IdDelete & "'"
            Dim cn As New SqlConnection(strConnection)
            Dim cm As New SqlCommand(strSQL, cn)
            Dim dr As SqlDataReader
            cn.Open()
            dr = cm.ExecuteReader
            dr.Read()
            dr.Close()
            cn.Close()
            MessageBox.Show("Delete Successfully")
            DataGridView1.Refresh()
        End If
    End Sub