[Solved] How to diagonally rotate WaterMark Text on Image in ASP.Net

I have modified the code from that article. But please note you will have to make adjustments in X and Y values based on the Image Height and Width.

Namespaces

using System.IO;
using System.Drawing;
using System.Drawing.Imaging;

Code

protected void Upload(object sender, EventArgs e)
{
    string watermarkText = "© ASPSnippets.com";

    //Get the file name.
    string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName) + ".png";

    //Read the File into a Bitmap.
    using (Bitmap bmp = new Bitmap(FileUpload1.PostedFile.InputStream, false))
    {
        using (Graphics grp = Graphics.FromImage(bmp))
        {
            //Set the Color of the Watermark text.
            Brush brush = new SolidBrush(Color.FromArgb(99, Color.Black));

            //Set the Font and its size.
            Font font = new System.Drawing.Font("Arial", 30, FontStyle.Bold, GraphicsUnit.Pixel);

            //Determine the size of the Watermark text.
            SizeF textSize = new SizeF();
            textSize = grp.MeasureString(watermarkText, font);

            //Position the text and draw it on the image.
            Point position = new Point((bmp.Width / 2), (bmp.Height / 2));

            //Rotate and Draw
            grp.TranslateTransform(position.X / 2, position.Y / 2);
            grp.RotateTransform(-45);
            grp.DrawString(watermarkText, font, brush, position.X - ((int)textSize.Width + 10), position.Y - ((int)textSize.Height + 10));
            grp.ResetTransform();

            using (MemoryStream memoryStream = new MemoryStream())
            {
                //Save the Watermarked image to the MemoryStream.
                bmp.Save(memoryStream, ImageFormat.Png);
                memoryStream.Position = 0;

                //Start file download.
                Response.Clear();
                Response.ContentType = "image/jpg";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);

                //Write the MemoryStream to the Response.
                memoryStream.WriteTo(Response.OutputStream);
                Response.Flush();
                Response.Close();
                Response.End();
            }
        }
    }
}

Screenshot