How to give global checkbox so that on checking of global chkbox i will able to chk all chkbox below in gridview.

<asp:GridView ID="gvChildGrid" runat="server" OnRowDataBound="gvChild_RowDataBound" AutoGenerateColumns="false" GridLines="none" Width="650px" >
<HeaderStyle Height="32px" CssClass="DG_ChildHeaderStyle" Font-Bold="true" HorizontalAlign="Center" VerticalAlign="Middle"></HeaderStyle>
<rowstyle cssclass="DG_ItemStyle" horizontalalign="left" verticalalign="Middle">
<alternatingrowstyle cssclass="DG_AlternateItemStyle" horizontalalign="left" verticalalign="Middle">
<columns> <asp:BoundField DataField="UI_NAME" HeaderText="" HeaderStyle-HorizontalAlign="Left" ItemStyle-Width="20%" />

<asp:TemplateField HeaderText="Access" HeaderStyle-HorizontalAlign="Left" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_access" />


<asp:TemplateField HeaderText="Add" HeaderStyle-HorizontalAlign="Left" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_add" />


<asp:TemplateField HeaderText="Edit" HeaderStyle-HorizontalAlign="Left" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_edit" />


<asp:TemplateField HeaderText="View" HeaderStyle-HorizontalAlign="Left" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_view" />


<asp:TemplateField HeaderText="Auth" HeaderStyle-HorizontalAlign="Left" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_auth" />


<asp:TemplateField HeaderText="Value Auth" HeaderStyle-HorizontalAlign="CENTER" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_vauth" />


<asp:TemplateField HeaderText="ViewSign" HeaderStyle-HorizontalAlign="CENTER" >
<itemtemplate>
<asp:CheckBox runat="server" ID="ui_viewsign" />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="SC_ID" runat="server" Value='<%# Eval("ID") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_access" runat="server" Value='<%# Eval("ui_access") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_add" runat="server" Value='<%# Eval("ui_add") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_edit" runat="server" Value='<%# Eval("ui_edit") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_view" runat="server" Value='<%# Eval("ui_view") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_auth" runat="server" Value='<%# Eval("ui_auth") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_vauth" runat="server" Value='<%# Eval("UI_VALUE_AUTH") %>' />


<asp:TemplateField>
<itemtemplate>
<asp:HiddenField ID="h_viewsign" runat="server" Value='<%# Eval("UI_VIEW_SIGN") %>' />