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gridview selected value
Sector Name    Amount Invested
Finance        300000
Properties     100000
...            ...

double TotalInvestments = 0.0;

for (int i = 0; i < gvSector.Rows.Count; i++)
{
    if (gvSector.Rows.Count > 0)
    {
        double SAmt = Convert.ToDouble(gvSector.Rows[i].Cells[1].Text);
        TotalInvestments += SAmt;
        double PercentSAmt = (SAmt / TotalInvestments) * 100;

        if (PercentSAmt > 25.0)
        {
            //I've no idea what to put here. It is supposed to show the sector(s) that is more than 25% from the gridview.

        }
    }
}

protected void Grid_RowDataBound(object sender, System.Web.UI.WebControls.GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow) {
        var data = (DataRowView)e.Row.DataItem;
        var lbSector = (Label)e.Row.FindControl("lbSector");
        var amount = (int)data("Amount");
        var amountOverAll = (long)data.DataView.Table.Compute("SUM(Amount)", null);
        if (amount * 100 / amountOverAll >= 30) {
            lbSector.Text = data("Sector").ToString();
        }
    }
}

double SAmt = Convert.ToDouble(gvSector.Rows[i].Cells[1].Text);
        TotalInvestments += SAmt;
        double PercentSAmt = (SAmt / TotalInvestments) * 100;

double PercentSAmt = (SAmt / TotalInvestments) * 100;
 if (PercentSAmt > 30.0)
 {
    gvSector.Rows[i].Cells[1].Text
 }

double PercentSAmt = (SAmt / TotalInvestments) * 100;
 if (PercentSAmt > 30.0)
 {
    lbSector.Text +=  gvSector.Rows[i].Cells[0].Text + " ";
 }