รบกวนสอบถามเรื่อง การวนลูปเพื่อสร้าง column ของ gridview

        DataTable dt = new DataTable();
        DataRow dr;
		
		//*** Column ***//
        dt.Columns.Add("CustomerID");
        dt.Columns.Add("Name");
        dt.Columns.Add("Email");
        dt.Columns.Add("CountryCode");
        dt.Columns.Add("Budget");
        dt.Columns.Add("Used");
		
		//*** Rows ***//
		dr = dt.NewRow();
        dr["CustomerID"] = "C001";
        dr["Name"] = "Win Weerachai";
        dr["Email"] = "[email protected]";
        dr["CountryCode"] = "TH";
        dr["Budget"] = "1000000";
        dr["Used"] = "600000";
        dt.Rows.Add(dr);

		//*** Rows ***//
		dr = dt.NewRow();
        dr["CustomerID"] = "C002";
        dr["Name"] = "John Smith";
        dr["Email"] = "[email protected]";
        dr["CountryCode"] = "EN";
        dr["Budget"] = "2000000";
        dr["Used"] = "800000";
        dt.Rows.Add(dr);

		//*** Rows ***//
		dr = dt.NewRow();
        dr["CustomerID"] = "C003";
        dr["Name"] = "Jame Born";
        dr["Email"] = "[email protected]";
        dr["CountryCode"] = "US";
        dr["Budget"] = "3000000";
        dr["Used"] = "600000";
        dt.Rows.Add(dr);
		
		//*** Rows ***//
		dr = dt.NewRow();
        dr["CustomerID"] = "C004";
        dr["Name"] = "Chalee Angel";
        dr["Email"] = "[email protected]";
        dr["CountryCode"] = "US";
        dr["Budget"] = "4000000";
        dr["Used"] = "100000";
        dt.Rows.Add(dr);