Thank you for reporting this issue. We have updated the help article and the update will be published with the next upload of the online help. Check out the following working code snippet:
private void detail_ItemDataBound(object sender, EventArgs e)
Telerik.Reporting.Processing.DetailSection section = (sender as Telerik.Reporting.Processing.DetailSection);
Telerik.Reporting.Processing.TextBox extraShipping = (Telerik.Reporting.Processing.TextBox)section.ChildElements.Find("extraShippingCostTextBox", false);
object val = section.DataObject["Weight"];
if (!(val is DBNull) && (Convert.ToDecimal(val)) > 10)
extraShipping.Visible = true;
extraShipping.Visible = false;
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