How do I create a diagonal cell border using EPPlus ASP.NET C#?

How do I create a diagonal cell using EPPlus ASP.NET C#?
 
I am using the following code, but a diagonal is not created in row 83 in Excel.
 
worksheet.Cells[83, 3].Style.Border.Diagonal.Style = ExcelBorderStyle.Thin;
worksheet.Cells[83, 3].Style.Border.DiagonalUp.ToString();
 
I want to create diagonol line in a cell which start up from top left border edge and end on bottom right border end