I need help to bind Asp.Net Data Chart

private string QueryString = "SELECT [Qty], [Hour], [ObjectifTotal] FROM [TRGCharts]";
  SqlConnection conn = new SqlConnection(ConnectionString);
           SqlCommand cmd = new SqlCommand(QueryString, conn);

           SqlDataAdapter da = new SqlDataAdapter();
           da.SelectCommand = cmd;
           DataTable dt = new DataTable();
           da.Fill(dt);
           Chart1.DataSource = dt;
           Chart1.Series["Series1"].XValueMember = dt.Columns["Hour"].ToString();
           Chart1.Series["Series1"].YValueMembers = dt.Columns["Qty"].ToString();
           Chart1.Series["Series2"].XValueMember = dt.Columns["Hour"].ToString();
           Chart1.Series["Series2"].YValueMembers = dt.Columns["ObjectifTotal"].ToString();
           Chart1.DataSource = dt;
           this.Chart1.Series["Series1"].Points.AddXY(dt.Columns["Hour"].ToString(), dt.Columns["Qty"].ToString());
           this.Chart1.DataBind();
           this.Chart1.Series["Series2"].Points.AddXY(dt.Columns["Hour"].ToString(), dt.Columns["ObjectifTotal"].ToString());
           this.Chart1.DataBind();