ASP.NET

int checkedCount = 0;
foreach (GridViewRow row in gvData.Rows)
{
bool result = ((CheckBox)row.FindControl("CheckBox1")).Checked;
if (result)
{
return true;
}
else
{
return false;
}
}

<asp:GridView ID="GridView1" runat="server">
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                      <input type="checkbox" id="chkitemheader" name="chkitemheader" onclick="SelectAll('chkitemheader');" />
                    <ItemTemplate>
                </asp:TemplateField>
            <Columns>
        </asp:GridView>
        <asp:GridView ID="GridView2" runat="server" style="visibility:hidden;">
        </asp:GridView>

    function SelectAll(id) {
        //get reference of GridView control
                        if(document.getElementById(id).checked)
                        {
                            var grid = document.getElementById("<%= GridView2.ClientID %>")
                            grid.style.visibility = "visible";
                        }
                        else {
                            var grid = document.getElementById("<%= GridView2.ClientID %>")
                            grid.style.visibility = "hidden";
                        }

    }
</script>

<asp:checkbox ...... OnClientClick = "return EnableBelowGrid(this.id)" />;

function EnableBelowGrid()
{
    var chkBoxID = arguments[0];
    if(document.getElementByID(chkBoxID).checked)
    {
        document.getElementById('<%=BelowGridID.ClientID%>').disabled = true
    }
    return false;
}

mouadel wrote:

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"A student i ss as CDA creation and development of application intranet, extranet and my project of end of study and a blend between discussion forum and site training numriser and courses video upload and download ben if quilqu a little m help if you plez"