Addressing a worksheet

ws.Cells["B1"].Value = "This is cell B1"; // Sets the value of Cell B1
ws.Cells[1, 2].Value = "This is cell B1"; // Also sets the value of Cell B1

worksheet.Cells["A1:B3"].Style.NumberFormat.Format = "#,##0"; //Sets the number format for a range
worksheet.Cells[1,1,3,2].Style.NumberFormat.Format = "#,##0"; //Same as above,A1:B3

worksheet.Cells["A1:B3,D1:E57"].Style.NumberFormat.Format = "#,##0"; //Sets the number format for a range containing two addresses.
worksheet.Cells["A:B"].Style.Font.Bold = true; //Sets font-bold to true for column A & B
worksheet.Cells["1:1,A:A,C3"].Style.Font.Bold = true; //Sets font-bold to true for row 1,column A and cell C3
worksheet.Cells["A:XFD"].Style.Font.Name = "Arial"; //Sets font to Arial for all cells in a worksheet.
worksheet.Cells.Style.Font.Name = "Arial"; //This is equal to the above.

//Access row and column properties. These properties are available from EPPlus 5.8.
worksheet.Rows[1, 18].Height = 25;
worksheet.Cells["A1:A18"].EntireRow.Height = 25; //Access row properties for a range, in this case row 1-18

worksheet.Columns[2, 3].Width = 18;
worksheet.Cells["B1:C1"].EntireColumn.Width = 18; //Access column properties for a range, in this case column B:C

var relRange1 = worksheet.Cells["A3:B4"].Offset(1, 1); //Returns a relative range to the range with 1 row and 1 column, B4:C5
var relRange2 = worksheet.Cells["C3:D4"].Offset(-1, -1); //Returns a relative range to the range with -1 row and -1 column, B2:C3;
var relRange3 = worksheet.Cells["C3:D4"].Offset(1, 1, 1, 1); //Returns a relative range to the range with 1 row and 1 column, but only the first cell, D4;