Change Image Attributes dynamically

This Snippet changes the Image details like : Author,Title,Summary,Comments etc ..when you draw image from System.Drawing namespace::

Also it causes a Force download and you can enetr your own file attributes in Author,Title,Summary,Comments etc ..

When you visit the any Page and save Image:

Below code will Save the User Name , the Ip Address ,time and the name of the image with force downlaod.

This string can be added in any Attribute :  Author,Title,Summary,Comments etc ..

Remember to FInd the User Yourself by MemberShip API

Clicking on any the Image button,or Datagrid,Gridview,Listview having Image Button:

pass the Query string to next page :

                          asp:ImageButton ID="imgButton" runat="server" 

                         ImageUrl='%# Eval("imageid", "Gallery/Thumbnail/{0}.jpg") %' OnClick="imgButton_Click" 

                            

 protected void imgButton_Click(object sender, ImageClickEventArgs e)

    {

        ImageButton img = (ImageButton)sender;

        HiddenField HF = (HiddenField)Page.Master.FindControl("HiddenField1");

        HF.Value = img.ImageUrl.ToString();

        Response.Redirect("openImage.aspx?ID=" + HF.Value + "");

    }

//and on second page Page load event :

protected void Page_Load(object sender, EventArgs e)

    {

        string Img = Request.QueryString["ID"].ToString();

        System.Web.UI.WebControls.Image im = new System.Web.UI.WebControls.Image();

        string strUrl = Img.Split('/')[2].ToString();

        string newImgUrl = strUrl.Replace(strUrl, "Gallery/HiRes/" + strUrl);

        im.ImageUrl = newImgUrl;

        im.AlternateText = Img;

        MembershipUser Usr = Membership.GetUser();

            

        string strIpAddress = Request.UserHostAddress;

        string strImageName = im.ImageUrl;

        DateTime Time = DateTime.Now.ToLocalTime();

        string strDestFileName = Usr + " - "+ strIpAddress + " - " + Time + " - " + System.IO.Path.GetFileName(strImageName);

        WriteProperties(strDestFileName , strImageName);

        

        Form.Controls.Add(im);

        

    }

 private void WriteProperties(string text ,string ImageName)

    {

        

        System.Drawing.Image imImage = System.Drawing.Image.FromFile(Server.MapPath("~/") + ImageName);

        System.Drawing.Imaging.PropertyItem[] AllProperties = imImage.PropertyItems;

        System.Drawing.Imaging.PropertyItem NewProp = AllProperties[0];

        byte[] Value = System.Text.ASCIIEncoding.Unicode.GetBytes(text);

        NewProp.Id = 40092;  // Comments

        NewProp.Len = Value.Length;

        NewProp.Value = Value;

        NewProp.Type = 1;

        imImage.SetPropertyItem(NewProp);

        ShowImage(imImage);

                      

    }

 private void ShowImage(System.Drawing.Image bmp)

    {

         HttpContext.Current.Response.Clear();

        HttpContext.Current.Response.ContentType = "image/jpeg";

        HttpContext.Current.Response.AppendHeader("Content-disposition", "attachment; filename=");

        bmp.Save(HttpContext.Current.Response.OutputStream,System.Drawing.Imaging.ImageFormat.Jpeg);

        bmp.Dispose();

        HttpContext.Current.Response.End();

    }

Thanks,

Nitin Sharma