how to calculate cummulative frequency

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hi how to calculate cummulative frequency in gridview ? using column values of gridview col1 cf 2 2 3 5 4 8 5 13 like this. the user will enter only the first col values.. how to calculate second column values using gridview. my coding is

string  pr1 = gv.Rows[0].Cells[4].ToString();
    //int pr = System.Convert.ToInt32(pr1);
    int rw1;
    for (int ri =0; ri <= gv.Rows.Count - 2; ri++)
    {

        GridViewRow rw = gv.Rows[ri];
        GridViewRow prrw = gv.Rows[ri+1];
        //for (int i = 1; i < rw.Cells.Count; i++)
        //{
            prrw.Cells[5].Text = pr1;
            rw1 = System.Convert.ToInt32(rw.Cells[4].Text) + System.Convert.ToInt32(prrw.Cells[4].Text);
            pr1 = rw1.ToString ();
    }

but the output was displaying

col1   cf
2
3   System.Web.UI.WebControls.DataControlFieldCell
4   5
6   7
8   10

Posted 8-Feb-11 17:52pm

gowdhami

Updated 8-Feb-11 20:35pm

v6

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Albin Abel 9-Feb-11 0:23am

Please explain more. Are you asking about calculate cumulative frequency of values in a single column?

gowdhami 9-Feb-11 0:27am

yes i have to calculate cf for single column values and it should be display in another column

Albin Abel 9-Feb-11 1:25am

just loop through the gridview rows, calculate the cumulative and update the cf column. Is that way you don't want? or you are looking for the exact coding?. What are those gridview field types?

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Albin Abel · Accepted Answer · 2011-02-08T20:42:00

Hi
Assuming you have both columns are databound. I have the aspx code like this

XML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
    DataSourceID="SqlDataSource1"
     OnDataBound="GridView1_OnDatabound">
    <Columns>
        <asp:BoundField DataField="col1" HeaderText="col1" SortExpression="col1" />
        <asp:BoundField DataField="cf" HeaderText="cf" SortExpression="cf" />
    </Columns>
</asp:GridView>

onDatabound event I am calculating the cf and populate as follows. Again assuming the col1 is the first column and cf is the second one, otherwise you need to change the index position as per your gridview

C#

protected void GridView1_OnDatabound(object sender, EventArgs e)
{
    int cf =0;
    int currentValue = 0;
    foreach (GridViewRow row in GridView1.Rows)
    {
        currentValue = Convert.ToInt32(row.Cells[0].Text);
        cf += currentValue;
        row.Cells[1].Text = cf.ToString();
    }
}

Let me know if that works!