Acessing Dynamic control checkbox value and ID

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ASP.NET

Hi guys i have created dynamic checkbox ,
those controls i add it in one of my panel control.
now i want those checkbox ID and text in my button click event..
My Code is Here
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private SortedList AcessingDynamicControls()
{
SortedList sList = new SortedList();
dTable=new DataTable();
dTable.Clear();
dTable = MPostOfProperty.ReturnAmenitiesDetail("Select detail_id from CB_VIEW_Amenities");
for (int i = 0; i < dTable.Rows.Count; i++)
{
string ID;
bool status;
//CheckBox box = new CheckBox();
//box = this.FindControl(dTable.Rows[i]["id"].ToString()) as CheckBox;
//ID = box.UniqueID;
//status = box.Checked;
CheckBox chk = (CheckBox)PanelAmenities.FindControl(dTable.Rows[i]["detail_id"].ToString());
string s = dTable.Rows[i]["detail_id"].ToString();
ID = chk.UniqueID;
status = chk.Checked;
sList.Add(ID, status.ToString());
}
return sList;
}

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ID = chk.UniqueID;
status = chk.Checked;
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when the above code executed an exception generates.Object refrence not set to an instance.I think this is the pblm of postback.Please help me.How we can acess dynamic control properties