XtraChart Binding data source

Hi Angela,
The error message is self-explanatory. It looks like you are using a non-numerical data field ("Sum") to initialize the Series.ValueDataMembers property.
Chart can represent only numerical or DateTime values (Y-Axis) on its diagram. If you are using the "Sum" data field to initialize the Series.ArgumentDataMember property, try to switch the Series.ArgumentScaleType property to Qualitative.
See also: ScaleType Members.
Thanks,
Alex

I see. But my ValueDataMembers is Numerical.And i don't know why it not run!..Please help me!.
 private DataTable bieudo;
        private ChartTitle title;
        Series series1;
      private void InitializeChart()
        {
          // data type of colum Tentrai is string and of colum Soluong is int
            string sql = "select Tentrai,Soluong from trangtrai";
            bieudo= MapGlobal.Soluongdich(sql);

series1 = new Series("Số lượng dịch", ViewType.ManhattanBar);
                lineChart.Series.Add(series1);

series1.DataSource = bieudo;

// Specify data members to bind the series.
                series1.ArgumentScaleType = ScaleType.Qualitative;
                series1.ArgumentDataMember = "Tentrai";
                series1.ValueScaleType = ScaleType.Numerical;
                series1.ValueDataMembers.AddRange(new string[] {"Soluong"});
                // Here is Error: The type of the "Soluong" value data member isn't compatible with the Numerical scale.
                // Add a chart title.
                title = new ChartTitle();
                title.Font = new System.Drawing.Font("Tahoma", 18F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
                title.Text = "Biểu Đồ Tổng Số Lượng Dịch Các Trại Theo Khoảng Thời Gian";
                title.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(0)))), ((int)(((byte)(0)))));
                lineChart.Titles.Add(title);
                // Dock the chart into its parent and add it to the current form.
                lineChart.OptionsPrint.SizeMode = DevExpress.XtraCharts.Printing.PrintSizeMode.Stretch;
                lineChart.RuntimeSelection = true;
                lineChart.Visible = true;
                lineChart.Dock = DockStyle.Fill;
                lineChart.Legend.MarkerSize = new System.Drawing.Size(16, 16);
                pneBieudodich.Controls.Add(lineChart);
                //pneBieuDoNam.Controls.Add(lineChart);
            //}
        }

Hi Angela,
Thank you for your response. Could you please post your 'bieudo' object definition here, so that I can try to reproduce this problem locally?
Your cooperation is appreciated.
Thanks,
Alex