Getting empty in "objListCollection" while adding from dataTable. how to add? (WinForms)

ok

List<string> getListCol = new List<string>();
DataTable dtGetList = new DataTable();

//dtGetList.Columns.Add("Sl No").AutoIncrement = true; //For sorting numeric values set by typeof(int), default sorting is string.
DataColumn SlCol = new DataColumn("#", typeof(System.Int32));
dtGetList.Columns.Add(SlCol);
//SlCol.AutoIncrement = true;
//SlCol.AutoIncrementSeed = 1;
dtGetList.Columns.Add("Voucher Number");
dtGetList.Columns.Add("Voucher Date");
dtGetList.Columns.Add("Vendor Name");
dtGetList.Columns.Add("Cheque Amount");
dtGetList.Columns.Add("Cheque Number", typeof(System.Int32));
//dtGetList.Columns.Add("Select", System.Type.GetType("System.Boolean")); //adding Checkbox to grid column header (Method 1)
dtGetList.Columns.Add(" ", System.Type.GetType("System.Boolean"));
//int SlCount = 1;
int CountChqNo = Convert.ToInt32(strChqNo);
foreach (DataRow dr in dsGetlist.Tables[0].Rows)
{
string strformat;
DataRow drGetList = dtGetList.NewRow();
strformat = "f" + Convert.ToInt32(dr["DecimalPlaces"]).ToString(); //Formatting Currency Value
drGetList["Voucher Number"] = dr["Voucher_No"];
drGetList["Voucher Date"] = dr["Voucher_Date"];
drGetList["Vendor Name"] = dr["VendorName"];
drGetList["Cheque Amount"] = Convert.ToDecimal(dr["Amount"]).ToString(strformat);
drGetList["Cheque Number"] = CountChqNo; //dr["TLRBR_Cheque_Number"]
drGetList[" "] = "false";

dtGetList.Rows.Add(drGetList);
//ChkdGetList = dtGetList;
CountChqNo = CountChqNo + 1; // Auto Increment etxtStartChequNo input No

getListCol.Add(dtGetList.ToString());
}