public static class BarcodeHelper
{
    public static string GenerateBarcodeWithText(string input, string textBelow)
    {
        // barcode: 50 pixels
        // margin: top 5 pixels
        // height of each text line is 17 pixels
        // text: maximum 3 lines
        // each 30 letters is: 1 line

        var eachLineHeight = 17;

        var eachLineLetters = 30;

        var maximumLines = 3;

        var maximumTextHeight = eachLineHeight * maximumLines;

        var resultWidth = 250;

        var barcodeHeight = 50;

        var textY = barcodeHeight + 5;

        // each 30 letters is: 1 line for example input length is 150 letters and for show 100 letters we need (150 / 30) 5 lines
        // each line is 17 pixels and text height will be (17 * 5) 102 pixels
        var textHeight = (textBelow.Length / eachLineLetters) * eachLineHeight;

        // if height of text be greater than (eachLineHeight * maximumLines) we use maximum text height (eachLineHeight * maximumLines)
        textHeight = textHeight > maximumTextHeight ? maximumTextHeight : textHeight;

        // if text height be less than 1 line we set 1 line height (17 pixels) to the text height
        // text height minimum is equal 1 linle (17 pixels)
        textHeight = textHeight < eachLineHeight ? eachLineHeight : textHeight;

        var resultHeight = textY + textHeight;
    }
}

<ItemGroup>
    <PackageReference Include="System.Drawing.Common" Version="6.0.0" />
</ItemGroup>

#region MainBitmap

var mainBitmap = new Bitmap(resultWidth, resultHeight);
using var rectangleGraphics = Graphics.FromImage(mainBitmap);
{
    var rectangle = new Rectangle(0, 0, resultWidth, resultHeight);
    rectangleGraphics.FillRectangle(Brushes.OrangeRed, rectangle);
}

using var rectangleStream = new MemoryStream();
{
    mainBitmap.Save(rectangleStream, ImageFormat.Png);
}

#endregion

private static Bitmap GenerateBarcodeImage(string input, int width, int height)
{
    var barcodeInstance = new Barcode();
    var barcodeImage = barcodeInstance.Encode(BarcodeLib.TYPE.CODE39, input, Color.Black,
        Color.OrangeRed, width, height);
    using var barcodeStream = new MemoryStream();
    {
        barcodeImage.Save(barcodeStream, ImageFormat.Png);
    }
    return (Bitmap)Image.FromStream(barcodeStream);
}

#region Barcode

var barcodeImage = GenerateBarcodeImage(input, resultWidth, barcodeHeight);

#endregion

#region MergedRectangleAndBarcode

var newMainBitmap = (Bitmap)Image.FromStream(rectangleStream);
var newBarcodeBitmap = barcodeImage;
using var newRectangleGraphics = Graphics.FromImage(newMainBitmap);
{
    newRectangleGraphics.DrawImage(newBarcodeBitmap, 0, 0);
}

using var mergedRectangleAndBarcodeStream = new MemoryStream();
{
    newMainBitmap.Save(mergedRectangleAndBarcodeStream, ImageFormat.Png);
}

#endregion

#region WriteText

var barcodeBitmap = (Bitmap)Image.FromStream(mergedRectangleAndBarcodeStream);
using var graphics = Graphics.FromImage(barcodeBitmap);
{
    using var font = new Font("Tahoma", 10);
    {
        var rect = new Rectangle(0, textY, resultWidth, textHeight);
        var sf = new StringFormat();
        sf.Alignment = StringAlignment.Center;
        sf.Trimming = StringTrimming.EllipsisCharacter;
        sf.FormatFlags = StringFormatFlags.DirectionRightToLeft;
        sf.LineAlignment = StringAlignment.Center;
        graphics.DrawString(textBelow, font, Brushes.Black, rect, sf);
        //graphics.DrawRectangle(Pens.Green, rect);
    }
}

using var finalStream = new MemoryStream();
{
    barcodeBitmap.Save(finalStream, ImageFormat.Png);
}

#endregion

return Convert.ToBase64String(finalStream.ToArray());

<img src="data:image/png;base64, @BarcodeHelper.GenerateBarcodeWithText("barcode text", "below text")" />

// Type 39 doesn't support lower case letters, for prevent exception, we convert all input letters to upper case
// more details: https://www.dntips.ir/newsarchive/details/18019
input = input.ToUpperInvariant();

if (textBelow.ContainsFarsi())
    sf.FormatFlags = StringFormatFlags.DirectionRightToLeft;