Styling the Excel document

//fill column A with solid red color from hex
worksheet.Column(1).Style.Fill.PatternType = ExcelFillStyle.Solid;
worksheet.Column(1).Style.Fill.BackgroundColor.SetColor(ColorTranslator.FromHtml("#FF0000"));

//fill row 4 with striped orange background
worksheet.Row(4).Style.Fill.PatternType = ExcelFillStyle.DarkHorizontal;
worksheet.Row(4).Style.Fill.BackgroundColor.SetColor(Color.Orange);

//make the borders of cell F6 thick
worksheet.Cells[6, 6].Style.Border.Top.Style = ExcelBorderStyle.Thick;
worksheet.Cells[6, 6].Style.Border.Right.Style = ExcelBorderStyle.Thick;
worksheet.Cells[6, 6].Style.Border.Bottom.Style = ExcelBorderStyle.Thick;
worksheet.Cells[6, 6].Style.Border.Left.Style = ExcelBorderStyle.Thick;

//make the borders of cells A18 - J18 double and with a purple color
worksheet.Cells["A18:J18"].Style.Border.Top.Style = ExcelBorderStyle.Double;
worksheet.Cells["A18:J18"].Style.Border.Bottom.Style = ExcelBorderStyle.Double;
worksheet.Cells["A18:J18"].Style.Border.Top.Color.SetColor(Color.Purple);
worksheet.Cells["A18:J18"].Style.Border.Bottom.Color.SetColor(Color.Purple);

//set the font type for cells C1 - C30
worksheet.Cells["C1:C30"].Style.Font.Size = 13;
worksheet.Cells["C1:C30"].Style.Font.Name = "Calibri";
worksheet.Cells["C1:C30"].Style.Font.Bold = true;
worksheet.Cells["C1:C30"].Style.Font.Color.SetColor(Color.Blue);

//Multiple Fonts in the same cell
ExcelRange rg = worksheet.Cells["A1"];
rg.IsRichText = true;
//ExcelRichText uses "using OfficeOpenXml.Style;"
ExcelRichText text1 = rg.RichText.Add("Text with Font1");
text1.Bold = true;
text1.Italic = true;
text1.Color = System.Drawing.Color.Blue;
ExcelRichText text2 = rg.RichText.Add("Text with Font2");
text2.UnderLine = true;
text2.Bold = false;
text2.Color = System.Drawing.Color.Red;
ExcelRichText text3 = rg.RichText.Add("Text with Font3");
text3.UnderLine = false;
text3.Strike = true;

//make column H wider and set the text align to the top and right
worksheet.Column(8).Width = 25;
worksheet.Column(8).Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
worksheet.Column(8).Style.VerticalAlignment = ExcelVerticalAlignment.Top;

//wrap text in the cells
worksheet.Column(8).Style.WrapText = true;

//create a new ExcelPackage
using (ExcelPackage excelPackage = new ExcelPackage())
{
    //create the WorkSheet
    ExcelWorksheet worksheet = excelPackage.Workbook.Worksheets.Add("Sheet 1");

    //add some dummy data, note that row and column indexes start at 1
    for (int i = 1; i <= 30; i++)
    {
        for (int j = 1; j <= 15; j++)
        {
            worksheet.Cells[i, j].Value = "Row " + i + ", Column " + j;
        }
    }

    //fill column A with solid red color
    worksheet.Column(1).Style.Fill.PatternType = ExcelFillStyle.Solid;
    worksheet.Column(1).Style.Fill.BackgroundColor.SetColor(ColorTranslator.FromHtml("#FF0000"));

    //set the font type for cells C1 - C30
    worksheet.Cells["C1:C30"].Style.Font.Size = 13;
    worksheet.Cells["C1:C30"].Style.Font.Name = "Calibri";
    worksheet.Cells["C1:C30"].Style.Font.Bold = true;
    worksheet.Cells["C1:C30"].Style.Font.Color.SetColor(Color.Blue);

    //fill row 4 with striped orange background
    worksheet.Row(4).Style.Fill.PatternType = ExcelFillStyle.DarkHorizontal;
    worksheet.Row(4).Style.Fill.BackgroundColor.SetColor(Color.Orange);

    //make the borders of cell F6 thick
    worksheet.Cells[6, 6].Style.Border.Top.Style = ExcelBorderStyle.Thick;
    worksheet.Cells[6, 6].Style.Border.Right.Style = ExcelBorderStyle.Thick;
    worksheet.Cells[6, 6].Style.Border.Bottom.Style = ExcelBorderStyle.Thick;
    worksheet.Cells[6, 6].Style.Border.Left.Style = ExcelBorderStyle.Thick;

    //make the borders of cells A18 - J18 double and with a purple color
    worksheet.Cells["A18:J18"].Style.Border.Top.Style = ExcelBorderStyle.Double;
    worksheet.Cells["A18:J18"].Style.Border.Bottom.Style = ExcelBorderStyle.Double;
    worksheet.Cells["A18:J18"].Style.Border.Top.Color.SetColor(Color.Purple);
    worksheet.Cells["A18:J18"].Style.Border.Bottom.Color.SetColor(Color.Purple);

    //make all text fit the cells
    worksheet.Cells[worksheet.Dimension.Address].AutoFitColumns();

    //i use this to make all columms just a bit wider, text would sometimes still overflow after AutoFitColumns(). Bug?
    for (int col = 1; col <= worksheet.Dimension.End.Column; col++)
    {
        worksheet.Column(col).Width = worksheet.Column(col).Width + 1;
    }

    //make column H wider and set the text align to the top and right
    worksheet.Column(8).Width = 25;
    worksheet.Column(8).Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
    worksheet.Column(8).Style.VerticalAlignment = ExcelVerticalAlignment.Top;

    //get the image from disk
    using (System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath("logo.jpg")))
    {
        var excelImage = worksheet.Drawings.AddPicture("My Logo", image);

        //add the image to row 20, column E
        excelImage.SetPosition(20, 0, 5, 0);
    }
}

//get the image from disk
using (System.Drawing.Image image = System.Drawing.Image.FromFile(HttpContext.Current.Server.MapPath("logo.jpg")))
{
    var excelImage = worksheet.Drawings.AddPicture("My Logo", image);

    //add the image to row 20, column E
    excelImage.SetPosition(20, 0, 5, 0);
}