dynamic datagrid rows

protected void Button1_Click(object sender, EventArgs e)



    {



        dt.Columns.Add("Name");



        DataRow dr = dt.NewRow();



        dr[0] = "Jesus";



        dt.Rows.Add(dr);







        BoundField BFiled1 = new BoundField();



        BFiled1.HeaderText = "Name";



        BFiled1.DataField = "Name";



        grd1.Columns.Add(BFiled1);







        grd1.DataSource = dt;



        grd1.DataBind();



    }

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<asp:TextBox ID="txtCount" runat="server"></asp:TextBox>

 <asp:Button ID="btnSubmit" runat="server" Text="GetRecords" OnClick="GetRecords" />

<br>

<asp:DataGrid ID="datagrid1" runat="server"  AllowSorting="true" AutoGenerateColumns="false">            

</asp:DataGrid>

 protected  void GetRecords(object sender,EventArgs e)

    {

        datagrid1.PageSize = int.Parse(txtCount.Text.ToString());

        DataTable table = new DataTable();

        using (SqlConnection con = new SqlConnection(_connStr))

        {

            string sqlquery = "select *from Login";

            using (SqlCommand cmd = new SqlCommand(sqlquery, con))

            {

                SqlDataAdapter da = new SqlDataAdapter(cmd);

                da.Fill(table);

            }

            datagrid1.DataSource = table;

            datagrid1.DataBind();

        }

    }