Automatically print page when it loads using JavaScript

Hi,

I am having button field in grid for print button.

<asp:GridView ID="griddata" runat="server" AutoGenerateColumns="False" DataKeyNames="BillID"
                        HeaderStyle-CssClass="txtbx" CssClass="txtbx" Visible="False" Width="857px">
                        <Columns>
                            <asp:ButtonField CommandName="PRINT" ButtonType="Image" HeaderText="Print" ImageUrl="~/images/print.gif"
                                Text="PRINT">
                                <HeaderStyle ForeColor="Green" />
                            </asp:ButtonField>
                            
                            
                        </Columns>
                        <HeaderStyle CssClass="txtbx" />
                    </asp:GridView>

On grid row command i open url with query string the page i want to print, then press ctrl+p to take print.

Protected Sub gridData_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles griddata.RowCommand
        If e.CommandName = "PRINT" Then
            Response.Redirect("frmBillWO.aspx?qsBillID=" & griddata.DataKeys(e.CommandArgument).Value)
            
        End If
    End Sub

how to open other page directly for print on button click in grid