Enable or check all the checkbox inside datalist

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ASP.NET

Hi,

I am having datalist which is having list of checkboxes. One of the datalist item is ALL. If user check that ALL(checkbox), then I want to check all remaining checkboxes or disable all the remaining checkboxes.

I am using the below given code, but it is not working. Tell me some efficient way to do this.

protected void chkFacilityChanged(object sender,   EventArgs e)
    { 
        foreach (DataListItem rptItem in rptFactility.Items)
        {
           CheckBox allchk = (CheckBox)rptItem.FindControl("chkFacility").ToString();
          string  facilityCode = rptItem.FindControl("lblFacilityCode").ToString();
           if ( facilityCode.Text.ToString() = "0"   && allchk.checked)
             {                 
                allchk1.Checked = true;
               //rptItem1.Enabled = false;
                }
               return;
            }
        }
}

OR

protected void chkFacilityChanged(object sender,   EventArgs e)
    {
        foreach (DataListItem rptItem in rptFactility.Items)
        {
           CheckBox allchk = (CheckBox)rptItem.FindControl("chkFacility").ToString();

          string  facilityCode = rptItem.FindControl("lblFacilityCode").ToString();
           if ( facilityCode.Text.ToString() = "0"   && allchk.checked)
             {
               foreach (DataListItem rptItem1 in rptFactility.Items)
        {
                CheckBox allchk1 = (CheckBox)rptItem.FindControl("chkFacility").ToString();

                allchk1.Checked1 = true;
               //rptItem1.Enabled = false;
                }
               return;
            }
        }
}