Gridview - Summary and Percent Column - asp.net

Question

I am creating a simple gridview on page.
Data comes from an sql procedure.
Here is how it looks right now:
My first question is how to calculate percentage for "%" columns. Formula is quite simple:
For example in selected cell it should be 15612/238171 * 100%
I'm calculating summary of every row like so:
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="sprawy" runat="server" Text='<%#Sprawy(Eval("sprawy"),1) %>' />
</ItemTemplate>
<FooterTemplate>
<asp:Label ID="sumaSpraw" runat="server" Text='<%#GetSumaSpraw(1) %>' />
</FooterTemplate>
</asp:TemplateField>
This is my code for column in gridview
And this is code for functions:
public Int32[] SumaSpraw = new Int32[4];
public Int32 Sprawy(object arg1, int i)
{
var ilosc = arg1 != DBNull.Value ? Convert.ToInt32(arg1) : 0;
SumaSpraw[i - 1] += ilosc;
return ilosc;
}
public Int32 GetSumaSpraw(int i)
{
return SumaSpraw[i - 1];
}
I would like to know how to calculate value of "%" cells based on summary from one row and cell value.
My second question:
Is it possible to modify view on grid view to display data in group like so:

Answer 1

I've managed to do the first part by adding 2 event listeners to gridview, onRowDataBound and onDataBound.
This is my code to this methods:
protected void GridViewOnRowDataBound(object sender, GridViewRowEventArgs e)
{
int i=0;
if (sender == GridView1)
i = 0;
else if (sender == GridView2)
i = 1;
if (e.Row.RowType == DataControlRowType.DataRow)
{
SumaSpraw[i] += Convert.ToInt32(((Label)e.Row.FindControl("sprawy")).Text);
SumaAdresow[i] += Convert.ToInt32(((Label)e.Row.FindControl("adresy")).Text);
SumaInPost[i] += Convert.ToInt32(((Label)e.Row.FindControl("inpost")).Text);
SumaPoczta[i] += Convert.ToInt32(((Label)e.Row.FindControl("poczta")).Text);
}
if (e.Row.RowType == DataControlRowType.Footer)
{
((Label)e.Row.FindControl("sumaSpraw")).Text = SumaSpraw[i].ToString("N0");
((Label)e.Row.FindControl("sumaAdresow")).Text = SumaAdresow[i].ToString("N0");
((Label)e.Row.FindControl("sumaInPost")).Text = SumaInPost[i].ToString("N0");
((Label)e.Row.FindControl("sumaPoczta")).Text = SumaPoczta[i].ToString("N0");
}
}
protected void GridViewOnDataBound(object sender, EventArgs e)
{
int i = 0;
if (sender == GridView1)
i = 0;
else if (sender == GridView2)
i = 1;
decimal percent = 0M;
foreach (GridViewRow row in ((GridView)sender).Rows)
{
percent = (Convert.ToInt32(((Label)row.FindControl("adresy")).Text) / SumaAdresow[i]) * 100;
((Label)row.FindControl("procentAdresow")).Text = FormatPercent(Math.Round(percent, 2));
percent = (Convert.ToInt32(((Label)row.FindControl("inpost")).Text) / SumaInPost[i]) * 100;
((Label)row.FindControl("procentInPost")).Text = FormatPercent(Math.Round(percent, 2));
percent = (Convert.ToInt32(((Label)row.FindControl("poczta")).Text) / SumaPoczta[i]) * 100;
((Label)row.FindControl("procentPoczta")).Text = FormatPercent(Math.Round(percent, 2));
}
}
protected string FormatPercent(decimal percent)
{
if (percent == decimal.Truncate(percent))
{
return percent.ToString("N0") + "%";
}
else if (percent * 10 == decimal.Truncate(percent * 10))
{
return percent.ToString("N1") + "%";
}
else if (percent*100 == decimal.Truncate(percent*100))
{
return percent.ToString("N2") + "%";
}
else
return percent.ToString("N0") + "%";
}
Third method is used to format output.
But still I'm wondering about second part- how to merge only 2 cells from 2 rows (like in my second screen).
I've done the styling part. Maybe the code isn't looking so awesome, but it works :)
public static void GridViewRowMerger(GridView gridView, int collIndex)
{
for (int rowIndex = gridView.Rows.Count - 2; rowIndex >= 0; rowIndex--)
{
GridViewRow currentRow = gridView.Rows[rowIndex];
GridViewRow previousRow = gridView.Rows[rowIndex + 1];
if (currentRow.Cells[collIndex].Text != previousRow.Cells[collIndex].Text) continue;
if (previousRow.Cells[collIndex].RowSpan < 2)
{
currentRow.Cells[collIndex].RowSpan = 2;
}
else
currentRow.Cells[collIndex].RowSpan = previousRow.Cells[collIndex].RowSpan + 1;
previousRow.Cells[collIndex].Visible = false;
}
}
public static void GridViewRefreshStyle(GridView gridView, int collIndex)
{
int rows = 0;
for (int rowIndex = 0; rowIndex < gridView.Rows.Count; rowIndex++)
{
if (gridView.Rows[rowIndex].Cells[collIndex].RowSpan > 1)
{
for (int i = 0; i < gridView.Rows[rowIndex].Cells[collIndex].RowSpan; i++)
{
gridView.Rows[rowIndex + i].CssClass = rows%2 == 0
? gridView.RowStyle.CssClass
: gridView.AlternatingRowStyle.CssClass;
}
rowIndex += gridView.Rows[rowIndex].Cells[collIndex].RowSpan - 1;
}
else
{
gridView.Rows[rowIndex].CssClass = rows%2 == 0
? gridView.RowStyle.CssClass
: gridView.AlternatingRowStyle.CssClass;
}
rows++;
}
}
So after binding data do GridView I just call those 2 methods like so:
GridView2.DataSource = dSet.Tables[1];
GridView2.DataBind();
GridViewRowMerger(GridView2, 0);
GridViewRefreshStyle(GridView2, 0);