check box list items will be selected

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C#

ASP.NET

Hii in my application based on drop down item selection check box list fill some items.after fill the items all the items will be checked .


please share any idea to me.

i am using this code

companyname = Droppeersnlcompanylist.SelectedItem.ToString();
            string state = droppeersstate.SelectedItem.Text; ;
            string lob = droppeerslob.SelectedItem.Text;
            string top = Droppeerstop.SelectedItem.Text;
            dalclasss objDAL = new dalclasss();
            DataTable dt = new DataTable();
            dt = objDAL.Getdata(companyname, state, lob, top);

            checkboxsnlcompanylist.Items.Clear();
            //Session["peers"] = dataTable;
            checkboxsnlcompanylist.DataSource = dt_peers;
            checkboxsnlcompanylist.DataTextField = dt_peers.Columns[0].ToString();
            checkboxsnlcompanylist.DataValueField = dt_peers.Columns[0].ToString();
            
            checkboxsnlcompanylist.DataBind();
            for (int i = 0; i < checkboxsnlcompanylist.Items.Count; i++)
            {
                checkboxsnlcompanylist.SelectedItem.Selected = true;
            }

please share any idea to me