Gridview Header Checkbox Select and Deselect ALL Rows Checkbox

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Import Jquery

<script src="jquery.min.js"></script>


Use this Code With in Head Tag:

<script type="text/javascript">
        $(document).ready(function () {
            $('#chkselectall').click(function () {
                if ($('#chkselectall').is(':checked')) {
                    $('[id$=testGrd]').find('input:checkbox').prop('checked', true);
                }
                else {
                    $('input:checkbox[name$=chkid]').each(
                        function () {
                            $(this).removeAttr('checked');
                        });
                }
            });
        });
       
    </script>



GridView:

<table id="ContentPlaceHolder1_testGrd" cellspacing="0" border="1">
                              <tr>
                                <td><b>Sl#</b></td>
                                <td><b> Name</b></td>
                                <td><b> Image</b></td>
                                <td>Select All<input type="checkbox" id="chkselectall" title="Select All" /></td>
                              </tr>
  </table>
                             
    <asp:GridView ID="testGrd" runat="server" AutoGenerateColumns="False" ShowHeader="false">
          <Columns>
                <asp:BoundField SortExpression="Sl"  DataField="Sl" HeaderText="Sl#" />
                                          
                   <asp:TemplateField HeaderText="Name" SortExpression="Name">
                     <ItemTemplate>
                        <asp:Label runat="server" ID="lblName" Text='<%# Bind("Name") %>'>                           </asp:Label>              
                      </ItemTemplate>
                    </asp:TemplateField>

                  <asp:TemplateField HeaderText="Image" SortExpression="Image">
                    <ItemTemplate>
                  <asp:Image ID="Image1" runat="server" ImageUrl ='<%# "~/Uploads/Image/"+  Eval("Image") %>' />
                  </ItemTemplate>
                 </asp:TemplateField>

                <asp:TemplateField HeaderText="Select" SortExpression="Select">
                    <ItemTemplate>
                       <asp:CheckBox ID="chkid" value='<%# Eval("Id") %>' runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>

     </asp:GridView>

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