How to add multiple records insert in datatable from dataset using loop C#

<pre> DataTable dt = new DataTable();


        dt.Columns.Add("Exp_upto_Premonth", typeof(string));
        dt.Columns.Add("Exp Upto", typeof(string));
        dt.Columns.Add("Exp During", typeof(string));
        dt.Columns.Add("ExpUptoNow", typeof(string));
        dt.Columns.Add("schemeno", typeof(string));
        dt.Columns.Add("sch_amount", typeof(string));
        dt.Columns.Add("Desciption", typeof(string));
        dt.Columns.Add("sdate", typeof(string));
        //dt.Columns.Add("PreMonth", typeof(string));
        //dt.Columns.Add("CurrMonth", typeof(string));
        DataRow dr = dt.NewRow();
         Insrtds = GetDataExpen(wrkno, strtdt, CreatdDate,preMonth, enddt,curmonyr);
               

                if (Insrtds.Tables[0].Rows.Count != 0)
                {
                    for (i = 0; i < Insrtds.Tables[0].Rows.Count; i++)
                    {
                        //dr["schemeno"] = Insrtds.Tables[1].Rows[0][i];
                        dr["Exp_upto_Premonth"] = 
                         Insrtds.Tables[0].Rows[i]"Premonth"];
                        dr["Exp Upto"] = Insrtds.Tables[0].Rows[i]["ExpUpto"];
                        dr["Exp During"] = Insrtds.Tables[0].Rows[i]["CurrMonExp"];
                        dr["ExpUptoNow"] = Insrtds.Tables[0].Rows[i]["ExpUptoNow"];
                        dr["schemeno"] = Insrtds.Tables[0].Rows[i]["Schemeno"];
                        dr["sch_amount"] = Insrtds.Tables[0].Rows[i]["sch_amount"];
                        dr["Desciption"] = Insrtds.Tables[0].Rows[i]["disp"];
                        dr["sdate"] = Insrtds.Tables[0].Rows[i]["Schdate"];
                        dt.AcceptChanges();
                        //object[] row1 = dr.ItemArray;
                        
                    }
                    //InsertData(Insrtds,PreMonthName,CurrMonthName);
                }
                
                
            }
        }
        dt.Rows.Add(dr.ItemArray);
      
        ViewState["dt"] = dt;