calculating the percentage of total in gridview footer

Hi all, I am trying to get the % of my totals in a gridview footer .Can anyone help me . Here is my code in vb# The highlighted in bold line i need to show GPrice/NetPrice * 100 
Partial Class Reports_CustomerReport Inherits System.Web.UI.Page Private CostPrice As Decimal = 0 Private NetPrice As Decimal = 0 Private GPrice As Decimal = 0 Private GPecent As Decimal = 0
Protected Sub GridView1_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound 'check row type If e.Row.RowType = DataControlRowType.DataRow Then 'If row type is DataRow, add ProductSales Value to TotalSales CostPrice += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Expr1")) NetPrice += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Expr3")) GPrice += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Expr ...