how to use a chart with linking to database

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C#

hello everybody
i want to use a chart in my programm which i bring it's control from CodeProject but i face problems in some points , so if anybody can help or have any idea, this is code of chart:

			string[] labels = new string[iNbProduits];
			PointPairList list1 = new PointPairList();
			double[] y = new double[iNbProduits];
			//double[] y2 = new double[iNbProduits];
			_bd.Command.CommandText = "SELECT `Nom`, `solde`" +
				"FROM Client";
			_bd.Reader = _bd.Command.ExecuteReader();

// my problem is in this loop:
			for (int i=0; i<iNbProduits; i++) {
			if(_bd.Reader.Read()) {
			labels[i] = _bd.Reader["nom"].ToString();
//			y[i]=double.Parse(_bd.Reader["solde"].ToString());
			y[i]= Math.Sin( (double)_bd.Reader["solde"]);
// here sharpdevelop underlines under (list1.Add(y[i]);) exact under list1 and y !! 
			list1.Add(y[i]);
		//y2[i] = double.Parse(_bd.Reader["prixunitaire"].ToString());
				}//if
			}//for i
			_bd.Reader.Close();

please help
and thanks everybody
thanks everybody