how to add separated comma in asp.net datagrid values

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ASP.NET

SQL-Server

how to add separated comma in asp.net datagrid values??

This is my bind method,i need to bind a Amount with separated comma.how to do it??

if (Session["dt1"] != null) dt1 = (DataTable)Session["dt1"];
             DataRow dr = dt1.NewRow();
             dr["CusName"] = Label5.Text.Trim().ToString();//1
             dr["REP"] = Label6.Text.Trim().ToString();//2
             //Ageing
             DateTime dt = Convert.ToDateTime("2013-12-31 12:00:00.0000000"); //mm/dd/yyyy
             DateTime dt2 = Convert.ToDateTime(txtfromdate.Text);//mm/dd/yyyy
             TimeSpan ts = dt.Subtract(dt2);

             dr["AGEING"] = ts.Days.ToString();//3
             dr["DATE"] = txtfromdate.Text;//5
             dr["NUM"] = txtpaymentDetails0.Text;//6
             dr["AMOUNT"] = Double.Parse(txtamount.Text); //7

             dt1.Rows.Add(dr);
             Cusinvoicegrid.DataSource = dt1;
             Cusinvoicegrid.DataBind();