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SUM of column in datatable

DaveMon asked
Last Modified: 2010-05-18
Hello Experts,  I have a question about a web project I am working on, particularly, I am trying so get the SUM of a column of my databound Gridview. It currently works fine and displays three columns, but i am having problems tallying the last column for a total.

   protected void btnStart_Click(object sender, EventArgs e)
string sql = string.Format("SELECT DISTINCT OrdFile.Order#, OrdFile.Quote#, (QtFile.TotBoxSqFtWalls + QtFile.TotBoxSqFtTops + QtFile.TotBoxSqFtFlrs) FROM OrdFile INNER JOIN QtUnit ON (OrdFile.Quote# = QtUnit.Quote#) INNER JOIN QtFile ON (QtFile.Quote# = OrdFile.Quote#) AND (QtFile.QtBox# = OrdFile.QtBox#) WHERE OrdFile.DateSchProd BETWEEN {0} AND {1} AND OrdFile.Quote# = QtUnit.Quote#", startDate.Value, endDate.Value);
        DataSet ds1 = new DataSet();
        kpweb.DBService mydb = new kpweb.DBService();
        ds1 = mydb.runQTSQL(sql);

        GridView1.DataSource = ds1.Tables[0].DefaultView;

       if (ds1.Tables[0].Rows[0][0].ToString().ToUpper() != "NOTHING")
            for (int i = 0; i < ds1.Tables[0].Rows.Count; i++)
          string sqlJobStatusHistory = string.Format("SELECT SUM(Column1) FROM ds1.Tables[0]", ds1.Tables[0].Rows[i][1].ToString(), ds1.Tables[0].Rows[i][2].ToString());

                using (SqlConnection con = new SqlConnection(constrSQL))
                    using (SqlCommand cmd = new SqlCommand(sqlJobStatusHistory, con))
                            sqlJobStatusHistory = cmd.ExecuteScalar().ToString();

                        catch (Exception)

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        if (e.Row.RowType == System.Web.UI.WebControls.DataControlRowType.Footer)

            e.Row.Cells[1].Text = string.Format("Total :");
         //  Heres where I want the total displayed
         // e.Row.Cells[2].Text = string.Format("Total :");


thanks for any help on this.

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In line
-->>>string sqlJobStatusHistory = string.Format("SELECT SUM(Column1) FROM ds1.Tables[0]", ds1.Tables[0].Rows[i][1].ToString(), ds1.Tables[0].Rows[i][2].ToString());

You have typo and too many parameters. Did you mean:
string sqlJobStatusHistory = string.Format("SELECT SUM(Column1) FROM {0}", ds1.Tables[0].TableName);

You can use the Compute method on the DataTable.
- or - Since you are looping through all the rows, you could add them up as you go
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