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Upload Images with text or image watermark using ASP.NET

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <table cellpadding="4" cellspacing="3">
        <tr>
            <td>
                Images:
            </td>
            <td>
                <asp:FileUpload ID="mainImg" runat="server" />
            </td>
            <td>
                &nbsp;
            </td>
        </tr>
        <tr>
            <td>
                Watermark - Text:
            </td>
            <td>
                <asp:TextBox ID="txtWater" runat="server"></asp:TextBox>
            </td>
            <td>
                &nbsp;
            </td>
        </tr>
        <tr>
            <td>
                Watermark - Images:
            </td>
            <td>
                <asp:FileUpload ID="waterImg" runat="server" />
            </td>
            <td>
                &nbsp;
            </td>
        </tr>
    </table>
    <br />
    <asp:Button ID="Button1" runat="server" Text="Uplaod Image" OnClick="Button1_Click" />
    <br />
    <asp:Image ID="Image1" runat="server" />
    </form>
</body>
</html>
/////////////////////////////////////////////////////////////////////////////////////
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.Drawing.Imaging;
using System.Drawing;
using System.Drawing.Drawing2D;

public partial class test3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string mainImageName = "";
        string waterImageName = "";
        string waterFullPath = "";
        if (mainImg.HasFile)
        {
            //uplaod main image
            mainImageName = Path.GetFileName(mainImg.PostedFile.FileName);
            mainImg.PostedFile.SaveAs(Server.MapPath("upload/") + mainImageName);
            if (waterImg.HasFile)
            {
                //upload watermark image
                waterImageName = Path.GetFileName(waterImg.PostedFile.FileName);
                waterImg.PostedFile.SaveAs(Server.MapPath("upload/") + waterImageName);
                waterFullPath = Server.MapPath("upload/") + waterImageName;
            }
            ImageSetting(txtWater.Text, waterFullPath, Server.MapPath("upload/") + mainImageName, 450, 120);
            Image1.ImageUrl = "upload/" + mainImageName.Insert(mainImageName.LastIndexOf("."), "_new");
        }

    }
    public void ImageSetting(string wmText, string wmImage, string mainImage, int xPosition, int yPosition)
    {
        byte[] imageBytes = null;
        if (File.Exists(mainImage))
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile(mainImage);
            Graphics graphic;
            if (image.PixelFormat != PixelFormat.Indexed && image.PixelFormat != PixelFormat.Format8bppIndexed && image.PixelFormat != PixelFormat.Format4bppIndexed && image.PixelFormat != PixelFormat.Format1bppIndexed)
            {
                // Graphic is not a Indexed (GIF) image
                graphic = Graphics.FromImage(image);
            }
            else
            {
                /* Cannot create a graphics object from an indexed (GIF) image.
                 * So we're going to copy the image into a new bitmap so
                 * we can work with it. */
                Bitmap indexedImage = new Bitmap(image);
                graphic = Graphics.FromImage(indexedImage);

                // Draw the contents of the original bitmap onto the new bitmap.
                graphic.DrawImage(image, 0, 0, image.Width, image.Height);
                image = indexedImage;
            }
            graphic.SmoothingMode = SmoothingMode.AntiAlias & SmoothingMode.HighQuality;

            //Text Watermark properties
            Font myFont = new Font("Arial", 25, FontStyle.Bold);
            SolidBrush brush = new SolidBrush(Color.FromArgb(70, Color.White));
            SizeF textSize = new SizeF();
            if (wmText != "")
                textSize = graphic.MeasureString(wmText, myFont);

            //Image Watermark
            System.Drawing.Image ig = null;
            if (wmImage != "")
                ig = System.Drawing.Image.FromFile(wmImage);

            // Write the text watermark and image watermark across the main image.
            PointF pointF = new PointF(xPosition, yPosition);
            if (wmText != "")
            {
                graphic.DrawString(wmText, myFont, brush, pointF);
                xPosition += Convert.ToInt32(textSize.Width);
            }
            if (wmImage != "")
            {
                graphic.DrawImage(ig, pointF);
                xPosition += Convert.ToInt32(ig.Width);
            }
            if (wmText != "")
                yPosition += Convert.ToInt32(textSize.Height);
            if (wmImage != "")
                yPosition += Convert.ToInt32(ig.Height);

            using (MemoryStream memoryStream = new MemoryStream())
            {
                // save image in memoryStream with it format which get it from GetImageFormat function
                image.Save(memoryStream, GetImageFormat(mainImage));
                imageBytes = memoryStream.ToArray();
            }
            graphic.Dispose();
        }

        MemoryStream ms = new MemoryStream(imageBytes);
        System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);

        //save new image and rename it;
        returnImage.Save(mainImage.Insert(mainImage.LastIndexOf("."), "_new"));
        ms.Dispose();
        returnImage.Dispose();

    }

    //function to return Image Format
    ImageFormat GetImageFormat(String path)
    {
        switch (Path.GetExtension(path).ToLower())
        {
            case ".bmp": return ImageFormat.Bmp;
            case ".gif": return ImageFormat.Gif;
            case ".jpg": return ImageFormat.Jpeg;
            case ".png": return ImageFormat.Png;
            default: return null;
        }
    }
}

Now, when we upload image with any image watermark that we selected and text watermark that we type it in text watermark field, we will got as following example:

Before

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