protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack == false && GridWeb1.IsPostBack == false)
{
// Assign your own custom calculation engine to GridWeb
GridWeb1.CustomCalculationEngine = new GridWebCustomCalculationEngine();
// Access the active worksheet and add your custom function in cell B3
GridWorksheet sheet = GridWeb1.ActiveSheet;
GridCell cell = sheet.Cells["B3"];
cell.Formula = "=MYTESTFUNC(9.0)";
// Calculate the GridWeb formula
GridWeb1.CalculateFormula();
}
}