How to place watermark Image at center and rotate in ASP.Net

Hi Akshayr,

Refer the below code.

Code

protected void Upload(object sender, EventArgs e)
{
    string watermarkText = "© ASPSnippets.com";
    string fileName = Path.GetFileNameWithoutExtension(FileUpload1.PostedFile.FileName) + ".png";
    using (Bitmap bmp = new Bitmap(FileUpload1.PostedFile.InputStream, false))
    {
        using (Graphics grp = Graphics.FromImage(bmp))
        {
            Brush brush = new SolidBrush(Color.Red);
            Font font = new System.Drawing.Font("Arial", 30, FontStyle.Bold, GraphicsUnit.Pixel);
            SizeF textSize = new SizeF();
            textSize = grp.MeasureString(watermarkText, font);
            grp.TranslateTransform(bmp.Width / 2, bmp.Height / 2);
            grp.RotateTransform(45);
            grp.DrawString(watermarkText, font, brush, -(textSize.Width / 2), -(textSize.Height / 2));
            using (MemoryStream memoryStream = new MemoryStream())
            {
                bmp.Save(memoryStream, ImageFormat.Png);
                memoryStream.Position = 0;
                Response.Clear();
                Response.ContentType = "image/png";
                Response.AddHeader("Content-Disposition", "attachment; filename=" + fileName);
                memoryStream.WriteTo(Response.OutputStream);
                Response.Flush();
                Response.Close();
                Response.End();
            }
        }
    }
}

Screenshot