ShowFooter="True"

<FooterStyle BackColor="#cccccc" />

    private double sum = 0;

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowIndex >= 0)
        {
            sum += Convert.ToDouble(e.Row.Cells[3].Text);
        }
        else if (e.Row.RowType == DataControlRowType.Footer)
        {
            e.Row.Cells[2].Text = "总：";
            e.Row.Cells[3].Text = sum.ToString();
            e.Row.Cells[0].Text = "平均：";
            e.Row.Cells[1].Text = ((int)(sum / GridView1.Rows.Count)).ToString();
        }

    }

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