This text "<60 min" is not binding in the export excel using GridView

We are using the below code

var grid = new GridView();
HeaderCell2 = new TableCell();
HeaderCell2.Text = item.Goal;
HeaderCell2.HorizontalAlign = HorizontalAlign.Left;
HeaderCell2.BorderStyle = BorderStyle.Outset;
HeaderRow3.Cells.Add(HeaderCell2);