hai everybody....

i am kumar ,and i new to this site ...!! can any one help me that how can i add watermark while
uploading the image to database......
:)

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Drawing.Imaging;

using System.Text;

using System.Windows.Forms;

 

namespace Watermarking

{ 

    /// <summary>

    /// An Image Watermarking Utility

    /// </summary>

    public partial class frmWatermark : Form

    { 
#region Member Variables

 

string CurrentFile;

Image img;

ImageCodecInfo myImageCodecInfo;

System.Drawing.Imaging.Encoder myEncoder;

EncoderParameter myEncoderParameter;

EncoderParameters myEncoderParameters;

System.Drawing.Color myWatermarkColor;

System.Drawing.Font myFont;

 

#endregion

#region Constructor

 

/// <summary>

/// constructor with default configuration settings

/// </summary>

public frmWatermark()

{

    InitializeComponent();

 

    // setup default settings

    myWatermarkColor = Color.SteelBlue;

    cboOpacity.SelectedIndex = 2;

    optTop.Checked = true;

    txtWaterMark.Text = "Your Name " +

    char.ConvertFromUtf32(169).ToString() + " " +

    DateTime.Now.Year.ToString() + ", All Rights Reserved";

    myFont = txtWaterMark.Font;

}

 

#endregion


#region File IO

 

/// <summary>

/// Open an image file into the picture box control

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void openToolStripMenuItem_Click(object sender, EventArgs e)

{

    // configure the open file dialog to point to some

    // common (usable) image file formats

    openFileDialog1.Title = "Open Image File";

    openFileDialog1.Filter = "Bitmap Files|*.bmp" +

    "|Enhanced Windows MetaFile|*.emf" +

    "|Exchangeable Image File|*.exif" +

    "|Gif Files|*.gif|JPEG Files|*.jpg" +

    "|PNG Files|*.png|TIFF Files|*.tif|Windows MetaFile|*.wmf";

    openFileDialog1.DefaultExt = "bmp";

    openFileDialog1.FilterIndex = 1;

    openFileDialog1.FileName = "";

    openFileDialog1.ShowDialog();

     

    // if the user did not select a file, return

    if (openFileDialog1.FileName == "")

        return;

 

    // update the current file and form caption text

    CurrentFile = openFileDialog1.FileName.ToString();

    this.Text = "Watermark Utility: " + CurrentFile.ToString();

 

    try

    {

        // open the image into the picture box

        img = Image.FromFile(openFileDialog1.FileName, true);

        picContainer.Image = img;

 

        // resize the picture box to support scrolling

        // large images

        picContainer.Size = img.Size;

    }

    catch (Exception ex)

    {

        MessageBox.Show(ex.Message, "File Open Error");

    }

} 

 

/// <summary>

/// Save the Current Image with the Watermark

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnSave_Click(object sender, EventArgs e)

{

    try

    {

        // get the extension to figure out how to limit the save

        // option to the current image file type

        string strExt;

        strExt = System.IO.Path.GetExtension(CurrentFile);

        strExt = strExt.ToUpper();

        strExt = strExt.Remove(0, 1);

 

        // if the current image is, for example, a gif, only

        // allow the user to save the file with the watermark

        // as a gif

        SaveFileDialog1.Title = "Save File";

        SaveFileDialog1.DefaultExt = strExt;

        SaveFileDialog1.Filter = strExt + " Image Files|*." + strExt;

        SaveFileDialog1.FilterIndex = 1;

 

        if (SaveFileDialog1.ShowDialog() == DialogResult.OK)

        {

            if (SaveFileDialog1.FileName == "")

            {

                return;

            }

            else

            {

                // save the file with the name supplied by the user

                picContainer.Image.Save(SaveFileDialog1.FileName);

            }

 

            // update the current image file to point to the newly saved image

            CurrentFile = SaveFileDialog1.FileName;

            this.Text = "Watermark Utility: " + CurrentFile;

            MessageBox.Show(CurrentFile.ToString() + " saved.", "FileSave");

        }

        else

        {

            MessageBox.Show("The save file request was cancelled by

            user.", "Save Cancelled");

        }

    }

    catch (Exception ex)

    {

        MessageBox.Show(ex.Message.ToString(), "Image Save Error");

    }

}

 

#endregion
 

#region Image Format Conversion 

 

/// <summary>

/// Return the available image encoders

/// </summary>

/// <param name="mimeType"></param>

/// <returns></returns>

private static ImageCodecInfo GetEncoderInfo(String mimeType)

{

    int j;

    ImageCodecInfo[] encoders;

    encoders = ImageCodecInfo.GetImageEncoders();

    for (j = 0; j < encoders.Length; ++j)

    {

        if (encoders[j].MimeType == mimeType)

            return encoders[j];

    }

    return null;

} 

 

/// <summary>

/// Convert the current file to a bitmap

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void bitmapToolStripMenuItem_Click(object sender,

EventArgs e)

{

    // create a new name with the bitmap extension

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".bmp";

 

    try

    {

        // save the file as a bitmap

        img.Save(newName, ImageFormat.Bmp);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to bitmap.", "Error",

        MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK,MessageBoxIcon.Information);

}
 

/// <summary>

/// Convert the current image file to an EMF file

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void emfToolStripMenuItem_Click(object sender, EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".emf";

 

    try

    {

        img.Save(newName, ImageFormat.Emf);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to EMF format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

}
 

/// <summary>

/// Convert the current image file to an EXIF file

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void exifToolStripMenuItem_Click(object sender, EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".exif";

 

    try

    {

        img.Save(newName, ImageFormat.Exif);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to EXIF format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

 

/// <summary>

/// Convert the current image file to GIF format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void gIFFileToolStripMenuItem_Click(object sender,

EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".gif";

 

    try

    {

        img.Save(newName, ImageFormat.Gif);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to GIF format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

/// <summary>

/// Convert the current image file to JPEG format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void jPEGFileToolStripMenuItem_Click(object sender,

EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".jpg";

 

    // Get an ImageCodecInfo object that represents the JPEG codec.

    myImageCodecInfo = GetEncoderInfo("image/jpeg");

 

    // for the Quality parameter category.

    myEncoder = System.Drawing.Imaging.Encoder.Quality;

 

    // EncoderParameter object in the array.

    myEncoderParameters = new EncoderParameters(1);

 

    try

    {

        // Save the bitmap as a JPEG file with quality level 75.

        myEncoderParameter = new EncoderParameter(myEncoder, 75L);

        myEncoderParameters.Param[0] = myEncoderParameter;

        img.Save(newName, myImageCodecInfo, myEncoderParameters);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to JPEG format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

} 

 

/// <summary>

/// Convert the current image file to PNG format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void pNGFileToolStripMenuItem_Click(object sender,

EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".png";

 

    try

    {

        img.Save(newName, ImageFormat.Png);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to PNG format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

} 

 

/// <summary>

/// Convert the current image file to TIFF format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void tIFFFileToolStripMenuItem_Click(object sender,

EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".tif";

 

    try

    {

        img.Save(newName, ImageFormat.Tiff);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to TIFF format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

} 

 

/// <summary>

/// Convert the current image to WMF format

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void windowsMetafileToolStripMenuItem_Click(object sender,

EventArgs e)

{

    string newName = System.IO.Path.GetFileNameWithoutExtension(CurrentFile);

    newName = newName + ".wmf";

 

    try

    {

        img.Save(newName, ImageFormat.Wmf);

        CurrentFile = newName;

        picContainer.Image = Image.FromFile(CurrentFile);

        this.Text = "Watermark Utility: " + CurrentFile.ToString();

    }

    catch

    {

        MessageBox.Show("Failed to save image to WMF format.",

        "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

        return;

    } 

    MessageBox.Show("Image file saved to " + newName.ToString(),

    "Image Saved", MessageBoxButtons.OK, MessageBoxIcon.Information);

}

 

#endregion
 

Following the image conversion routines, the next region of code is used to perform the actual water marking functions. 

#region Watermarking 

 

/// <summary>

/// Display the watermark as it would appear after the

/// watermark were saved to the file

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnPreview_Click(object sender, EventArgs e)

{

    // Update the applicaton by reloading the image

    picContainer.Image = Image.FromFile(CurrentFile);

 

    int opac = 0;

    string sOpacity = cboOpacity.Text;

 

    // Determine the opacity of the watermark

    switch (sOpacity)

    {

        case "100%":

            opac = 255; // 1 * 255

            break;

        case "75%":

            opac = 191; // .75 * 255

            break;

        case "50%":

            opac = 127; // .5 * 255

            break;

        case "25%":

            opac = 64;  // .25 * 255

            break;

        case "10%":

            opac = 25;  // .10 * 255

            break;

        default:

            opac = 127; // default at 50%; .5 * 255

            break;

    } 

    // Get a graphics context

    Graphics g = Graphics.FromImage(picContainer.Image);

 

    // Create a solid brush to write the watermark text on the image

    Brush myBrush = new SolidBrush(Color.FromArgb(opac,myWatermarkColor));

 

    // Calculate the size of the text

    SizeF sz = g.MeasureString(txtWaterMark.Text, myFont);

 

    // Creae a copy of variables to keep track of the drawing position (X,Y)

    int X;

    int Y;

 

    // Set the drawing position based on the users

    // selection of placing the text at the bottom or top of the image

    if (optTop.Checked == true)

    {

        X = (int)(picContainer.Image.Width - sz.Width) / 2;

        Y = (int)(picContainer.Top + sz.Height) / 2;

    }

    else

    {

        X = (int)(picContainer.Image.Width - sz.Width) / 2;

        Y = (int)(picContainer.Image.Height - sz.Height);

    }

 

    // draw the water mark text

    g.DrawString(txtWaterMark.Text, myFont, myBrush,

    new Point(X, Y));

} 

 

/// <summary>

/// Set the font and color of the font for the watermark

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnFont_Click(object sender, EventArgs e)

{

    // default the current font and color to that

    // used in the watermark textbox

    fontDialog1.ShowColor = true;

    fontDialog1.Font = txtWaterMark.Font;

    fontDialog1.Color = txtWaterMark.ForeColor;

 

    if (fontDialog1.ShowDialog() != DialogResult.Cancel)

    {

        myFont = fontDialog1.Font;

        myWatermarkColor = fontDialog1.Color;

        txtWaterMark.Font = fontDialog1.Font;

        txtWaterMark.ForeColor = fontDialog1.Color;

    }

} 

 

#endregion

Once you have your converted image then do a simple IO call to save then run your upload script on the newly created file

Im not able to update the image after applying watermark. Its says ARGUMENT NULL EXCEPTION.
Can you pls help??

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