Question

I have seen several tutorials on how to achieve this.

However in my opinion they require a lot of prior knowledge on how to programatically refer to each item.

Does anyone have a link to or can create a relatively basic example of how to achive a running total in the footer for an ASP:Gridview?

Answer 1

This is what I use:

protected void InvoiceGridView_RowDataBound(object sender, GridViewRowEventArgs e)
{
    var invoice = (Invoice) e.Row.DataItem;
    if (e.Row.RowType == DataControlRowType.Header)
    {
        totalAmt = 0;
    }
    else if (e.Row.RowType == DataControlRowType.DataRow)
    {
        totalAmt += invoice.Amount;
    }
    else if (e.Row.RowType == DataControlRowType.Footer)
    {
        var amountTotalLabel = (TextBox) e.Row.FindControl("AmountTotalTextBox");
        amountTotalLabel.Text = totalAmt.ToString("0.00");
    }
}

TotalAmt is protected instance variable on the page. Not sure if it’s what you were looking for based on your comment about “programmatic knowledge.” But it works and is fairly straight-forward. The gridview is bound to a List<Invoice> in this case.