Question

I’m making a chart in C# that is linked to donation data. Each week, the total donations are recorded in the table. The chart pulls those numbers and graphs them in a line graph.

The problem that I’m having is that each week is being recorded as a day of the week, and so controls that should work based on weeks are not working correctly. I attached my code and a picture of the result below.

I want to know why each data point here is being displayed as a day of the week. Is it how I’m loading the data?

Thanks for any help that you can give.

Here’s my code:

        #region Chart4
        string DonationSelect = this.DonationSelect.SelectedValue;
        Time = Convert.ToInt32(DonationSelect);

        if (Time > 3)
            Chart4.Series[0].IsValueShownAsLabel = false;
        else
            Chart4.Series[0].IsValueShownAsLabel = true;

        Chart4.Series[0].ChartType = SeriesChartType.Line;
        Chart4.ChartAreas["ChartArea1"].AxisX.IsMarginVisible = true;

        StartDate = GetNextDay(DateTime.Today, DayOfWeek.Sunday);
        TargetDate = GetNextDay(StartDate.AddMonths(-1 * Time), DayOfWeek.Sunday);

        for (DateTime i = TargetDate; i <= DateTime.Now; i = i.AddDays(7))
        {
            int Donations = 0;
            var oDonation = oDatabase.ExecuteScalar(@"SELECT Offering FROM 
            tblStats WHERE Date=@Date",
                "Date", i);

            if (oDonation != null && oDonation != DBNull.Value)
            {
                Donations = Convert.ToInt32(oDonation);
            }
            //int Attendance = Convert.ToInt32();

            string Date = i.ToShortDateString();

            Chart4.Series[0].Points.AddXY(Date, Donations);
        }

        StripLine StripLine = new StripLine();

        StripLine.BackColor = Color.LightGray;
        StripLine.Interval = 1;
        StripLine.IntervalType = DateTimeIntervalType.Weeks;
        StripLine.StripWidth = .5;
        StripLine.StripWidthType = DateTimeIntervalType.Weeks;
        StripLine.IntervalOffset = 0;
        StripLine.IntervalOffsetType = DateTimeIntervalType.Days;

        Chart4.Legends.Add(new Legend("Legend3"));
        Chart4.Series[0].Legend = "Legend3";
        Chart4.Series[0].IsVisibleInLegend = true;
        Chart4.Series[0].LegendText = "Donations";
        Chart4.BorderSkin.SkinStyle = BorderSkinStyle.Emboss;
        Chart4.BackColor = Color.PowderBlue;
        Chart4.Series[0].BorderWidth = 3;
        Chart4.Series[0].BorderColor = Color.Orange;
        Chart4.ChartAreas["ChartArea1"].AxisX.Title = "Date";
        Chart4.ChartAreas["ChartArea1"].BackColor = Color.LightGray;
        Chart4.ChartAreas["ChartArea1"].BackSecondaryColor = Color.White;
        Chart4.ChartAreas["ChartArea1"].BackGradientStyle = GradientStyle.TopBottom;
        Chart4.ChartAreas["ChartArea1"].AxisX.StripLines.Add(StripLine);
        #endregion

Answer 1

Okay, so I fiddled around with it a lot more yesterday, and here was the problem:
string Date = i.ToShortDateString();

        Chart4.Series[0].Points.AddXY(Date, Donations);

The issue was that in order for dates to work right, they need to be added to the axis as DateTime variables instead of strings. As such, anything working with weeks simply counted in units of 7 strings.
The correct code is here:

            Chart4.Series[0].Points.AddXY(i, Donations);

Thanks for pointing me in the right direction!