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Multiple Calculations in Gridview Footer

I am using VS 2010 and C# asp.net 4.0. In the footer, I need to display 5 lines of summary information based on all the rows in the gridview.
Average
Minimum
Maximum
Range = Maximum-Minimum
Standard Deviation

I have the average calculating correctly and displaying correctly on the gridview footer. I'm including my sql selection and RowDataBound code. There may be an easier way to do this than I started, but this at least works. What I need to know how to do is get the minimum, maximum and std deviation calculated in the footer. My variables are all declared and set to 0 in the partial class.

      
            if (RadioButtonList1.SelectedIndex == 1)
            {
                SqlDataSource1.SelectParameters.Add(new Parameter("sample", System.TypeCode.String, DropDownList1.SelectedValue));
                SqlDataSource1.SelectParameters.Add(new Parameter("startdate", System.TypeCode.DateTime, txtStartDate.Text));
                SqlDataSource1.SelectParameters.Add(new Parameter("enddate", System.TypeCode.DateTime, txtEndDate.Text));
                SqlDataSource1.SelectCommand = "SELECT * FROM [VW_FIBER_DATA_ANALYSIS] WHERE [SAMPLE_DATE] BETWEEN @startdate AND @enddate AND SAMPLE_TYPE=@sample ORDER BY [SAMPLE_DATE]";
                GridView1.DataBind();
                GridView1.Visible = true;
            }


  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (DataBinder.Eval(e.Row.DataItem, "MOISTURE") != System.DBNull.Value)
                {
                    sumMoisture += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE"));
                    countMoisture += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "10_MESH_%") != System.DBNull.Value)
                {
                    sum10mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "10_MESH_%"));
                    count10mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "20_MESH_%") != System.DBNull.Value)
                {
                    sum20mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "20_MESH_%"));
                    count20mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "40_MESH_%") != System.DBNull.Value)
                {
                    sum40mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "40_MESH_%"));
                    count40mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "60_MESH_%") != System.DBNull.Value)
                {
                    sum60mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "60_MESH_%"));
                    count60mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "80_MESH_%") != System.DBNull.Value)
                {
                    sum80mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "80_MESH_%"));
                    count80mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "100_MESH_%") != System.DBNull.Value)
                {
                    sum100mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "100_MESH_%"));
                    count100mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "200_MESH_%") != System.DBNull.Value)
                {
                    sum200mesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "200_MESH_%"));
                    count200mesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "PAN_MESH_%") != System.DBNull.Value)
                {
                    sumPanmesh += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "PAN_MESH_%"));
                    countPanmesh += 1;
                }

                if (DataBinder.Eval(e.Row.DataItem, "PERCENT_RECOVERY") != System.DBNull.Value)
                {
                    sumPctRec += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "PERCENT_RECOVERY"));
                    countPctRec += 1;
                }

            }

            else if (e.Row.RowType == DataControlRowType.Footer)
            {
                if (countMoisture != 0)
                {
                    avgMoisture = sumMoisture / countMoisture;
                    maxMoisture = 0; 
                    minMoisture = 0;
                    rangeMoisture = maxMoisture-minMoisture;
                    stdevMoisture = 0;
                }

                if (count10mesh != 0)
                {
                    avg10mesh = sum10mesh / count10mesh;
                    max10mesh = 0;
                    min10mesh = 0;
                    range10mesh = max10mesh-min10mesh;
                    stdev10mesh = 0;
                }

                if (count20mesh != 0)
                {
                    avg20mesh = sum20mesh / count20mesh;
                    max20mesh = 0;
                    min20mesh = 0;
                    range20mesh = max20mesh-min20mesh;
                    stdev20mesh = 0;
                }

                if (count40mesh != 0)
                {
                    avg40mesh = sum40mesh / count40mesh;
                    max40mesh = 0;
                    min40mesh = 0;
                    range40mesh = max40mesh-min40mesh;
                    stdev40mesh = 0;
                }

                if (count60mesh != 0)
                {
                    avg60mesh = sum60mesh / count60mesh;
                    max60mesh = 0;
                    min60mesh = 0;
                    range60mesh = max60mesh-min60mesh;
                    stdev60mesh = 0;
                }

                if (count80mesh != 0)
                {
                    avg80mesh = sum80mesh / count80mesh;
                    max80mesh = 0;
                    min80mesh = 0;
                    range80mesh = max80mesh-min80mesh;
                    stdev80mesh = 0;
                }

                if (count100mesh != 0)
                {
                    avg100mesh = sum100mesh / count100mesh;
                    max100mesh = 0;
                    min100mesh = 0;
                    range100mesh = max100mesh-min100mesh;
                    stdev100mesh = 0;
                }

                if (count200mesh != 0)
                {
                    avg200mesh = sum200mesh / count200mesh;
                    max200mesh = 0;
                    min200mesh = 0;
                    range200mesh = max200mesh-min200mesh;
                    stdev200mesh = 0;
                }

                if (countPanmesh != 0)
                {
                    avgPanmesh = sumPanmesh / countPanmesh;
                    maxPanmesh = 0;
                    minPanmesh = 0;
                    rangePanmesh = maxPanmesh-minPanmesh;
                    stdevPanmesh = 0;
                }

                if (countPctRec != 0)
                {
                    avgPctRec = sumPctRec / countPctRec;
                    maxPctRec = 0;
                    minPctRec = 0;
                    rangePctRec = maxPctRec-minPctRec;
                    stdevPctRec = 0;
                }

                e.Row.Cells[9].Text = "Average:" + "<br />Maximum:" + "<br />Minimum:" + "<br />Range:" + "<br />Std. Dev.:";

                e.Row.Cells[10].Text = avgMoisture.ToString("##0.0") + "<br />" + maxMoisture.ToString("##0.0") + "<br />" + minMoisture.ToString("##0.0") + "<br />" + rangeMoisture.ToString("##0.0") + "<br />" + stdevMoisture.ToString("##0.0");

                e.Row.Cells[11].Text = avg10mesh.ToString("##0.0") + "<br />" + max10mesh.ToString("##0.0") + "<br />" + min10mesh.ToString("##0.0") + "<br />" + range10mesh.ToString("##0.0") + "<br />" + stdev10mesh.ToString("##0.0");

                e.Row.Cells[12].Text = avg20mesh.ToString("##0.0") + "<br />" + max20mesh.ToString("##0.0") + "<br />" + min20mesh.ToString("##0.0") + "<br />" + range20mesh.ToString("##0.0") + "<br />" + stdev20mesh.ToString("##0.0");

                e.Row.Cells[13].Text = avg40mesh.ToString("##0.0") + "<br />" + max40mesh.ToString("##0.0") + "<br />" + min40mesh.ToString("##0.0") + "<br />" + range40mesh.ToString("##0.0") + "<br />" + stdev40mesh.ToString("##0.0");

                e.Row.Cells[14].Text = avg60mesh.ToString("##0.0") + "<br />" + max60mesh.ToString("##0.0") + "<br />" + min60mesh.ToString("##0.0") + "<br />" + range60mesh.ToString("##0.0") + "<br />" + stdev60mesh.ToString("##0.0");

                e.Row.Cells[15].Text = avg80mesh.ToString("##0.0") + "<br />" + max80mesh.ToString("##0.0") + "<br />" + min80mesh.ToString("##0.0") + "<br />" + range80mesh.ToString("##0.0") + "<br />" + stdev80mesh.ToString("##0.0");

                e.Row.Cells[16].Text = avg100mesh.ToString("##0.0") + "<br />" + max100mesh.ToString("##0.0") + "<br />" + min100mesh.ToString("##0.0") + "<br />" + range100mesh.ToString("##0.0") + "<br />" + stdev100mesh.ToString("##0.0");

                e.Row.Cells[17].Text = avg200mesh.ToString("##0.0") + "<br />" + max200mesh.ToString("##0.0") + "<br />" + min200mesh.ToString("##0.0") + "<br />" + range200mesh.ToString("##0.0") + "<br />" + stdev200mesh.ToString("##0.0");

                e.Row.Cells[18].Text = avgPanmesh.ToString("##0.0") + "<br />" + maxPanmesh.ToString("##0.0") + "<br />" + minPanmesh.ToString("##0.0") + "<br />" + rangePanmesh.ToString("##0.0") + "<br />" + stdevPanmesh.ToString("##0.0");

                e.Row.Cells[19].Text = avgPctRec.ToString("###0.0") + "<br />" + maxPctRec.ToString("##0.0") + "<br />" + minPctRec.ToString("##0.0") + "<br />" + rangePctRec.ToString("##0.0") + "<br />" + stdevPctRec.ToString("##0.0");
            }

        }

Open in new window


I can get the range easily once I figure out how to get the minimum and maximum. Thanks in advance for any help you can provide.
screenshot.png
0
Carla Romere
Asked:
Carla Romere
  • 4
2 Solutions
 
Carla RomereDirector of Information TechnologyAuthor Commented:
Well, I was able to get the minimum and maximum by using this code in the RowDataBound event.

                    
if (minMoisture == 0 && Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE")) > 0 || Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE")) < minMoisture)
                    {
                        minMoisture = Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE"));
                    }

                    if (Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE")) > maxMoisture)
                    {
                        maxMoisture = Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE"));
                    }

Open in new window


I'm still working on the standard deviation piece.
0
 
Carla RomereDirector of Information TechnologyAuthor Commented:
I have not yet figured out how to get the standard deviation calculation into the footer of the GridView. Does anyone have any ideas on how to accomplish that?
0
 
jagssiduralaCommented:
We cannot achive std deviation through row databound as it is depends the calculated values with  in the grid.

so take one label out side the grid, using for each you can derive this. foreach is faster so no issues to implement std deviation with foreach.

in for each you have to find each individual sample value by databinder like Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "MOISTURE")).

follow steps explained in below Url in foreach.

http://standard-deviation.appspot.com/
0
 
Carla RomereDirector of Information TechnologyAuthor Commented:
I ended up using two gridviews and lining them up and doing the summary calculations using a view in SQL. It's working like a charm now.
0
 
Carla RomereDirector of Information TechnologyAuthor Commented:
I was not able to get the other solution doing what I needed to do. Since jagssidurala was the only one who responded at all, I wanted to give him the points.
0

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