//Drag and drop a panal control in asp.net web page

//Following will be the auto generated code with user defind controlName

protected System.Web.UI.WebControls.Panel PnlTimeExpence;

//Decleare one checkbox object

CheckBox chkList1;

//write a code to add dyanamic checkboxes



..
.. 
..     //code to add dyanamic controls(checkboxes). Check link above for adding dynamic checkboxes.

..

..

//Now we have a Panel control ready with multiple checkboxes.

//Fuction to select\Deselect checkboxes

          private void SelectAllCheckBoxControls(Control parent,bool checkedVal)

            {

            try

                {

                string strLeave=string.Empty;

                foreach (Control child in parent.Controls)

                    {

                    if (child.GetType().ToString().Equals("System.Web.UI.WebControls.CheckBox"))

                        {

                        CheckBox chk = (CheckBox)child;

                        chk.Checked=checkedVal;

                        }

                    }

                }

             catch(Exception exp)

                {

                throw new Exception("SelectAllCheckBoxControls  " + exp.Message);

                }

            }

        //Generate event on which we want to perform the select\deselect operation

          //Following code is using a checkbox control to select \deselect the Event

        private void chkReport_CheckedChanged(object sender, System.EventArgs e)

            {

            try

                {

                //Calling a userdefind function

                SelectAllCheckBoxControls(PnlTimeExpence,chkReport.Checked);

                }

                catch(Exception exp)

                {

                throw new Exception("chkReport_CheckedChanged  " + exp.Message);

                }

            }