C# .net - Need help create thumbnail

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I have a simple image upload script I am using that renames the images and saves it in a folder on my server.

But now I need to also create a smaller version of the image, rename it and save it to the same folder.

I'm new to this kind of coding. I have looked at lots of examples but am unable to get any to work. So I was hoping someone could help me with my code.

Here is my existing code:

JavaScript

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>
<script language="C#"  runat="server">
// UPLOAD ORIGINAL IMAGE WITH NEW FILE NAME
void Button1_Click(object Source, EventArgs e){
string id = Request.QueryString["id"];
Response.Write (id);
    if (File1.PostedFile != null){
        try{
            File1.PostedFile.SaveAs(Server.MapPath("uploads//")+"big"+id+".jpg");
            Span1.InnerHtml = "File uploaded successfully: "+"big"+id+".jpg";
        }
        catch (Exception exc){
            Span1.InnerHtml = "Error saving file" + "big"+id+".jpg" + "" + exc.ToString();
        }
		
    }
	
}
</script>
</head>
<body>
<form enctype="multipart/form-data"  runat="server">
  <p>File to Upload: 
    <input id="File1" type="file"  runat="server">
    <br>
    <input type=button id="Button1" value="Upload"  önServerClick="Button1_Click"  runat="server">
</br></p>
  <p><span id=Span1 style="font: 8pt verdana;"  runat="server" /></p>
</form>
</body>
</html>

Posted 15-Aug-12 2:51am

Member 9357549

Updated 15-Aug-12 2:53am

Kenneth Haugland

v2

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3 solutions

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Santhosh Kumar Jayaraman · Answer 1 · 2012-08-15T03:01:00

C#

protected void UploadBtn_Click(object sender, EventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            FileUpload1.SaveAs(MapPath("~/Image/" + FileUpload1.FileName));
            System.Drawing.Image img1 = System.Drawing.Image.FromFile(MapPath("~/Image/") + FileUpload1.FileName);
 
            System.Drawing.Image bmp1 = img1.GetThumbnailImage(75, 75, null, IntPtr.Zero);
            bmp1.Save(MapPath("~/Thumbnail/") + FileUpload1.FileName);
            ThumbnailImage.ImageUrl = "~/Thumbnail/" + FileUpload1.FileName;
           
        }
    }

I have used GetThumbnailImage method of the Image class. This method returns the thumbnail image for the given original image.This could be the best picture quality we can derive with thumbnail i guess.

Member 9357549 · Answer 2 · 2012-08-15T03:21:00

I tried that but I'm doing something wrong as its not working.

Sorry but i'm really new to this.

Here is my code:

XML

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>
<script language="C#" runat="server">
// UPLOAD ORIGINAL IMAGE WITH NEW FILE NAME
void Button1_Click(object Source, EventArgs e){
string id = Request.QueryString["id"];
Response.Write (id);
    if (File1.PostedFile != null){
        try{
            File1.PostedFile.SaveAs(Server.MapPath("uploads//")+"big"+id+".jpg");
            Span1.InnerHtml = "File uploaded successfully: "+"big"+id+".jpg";

            System.Drawing.Image img1 = System.Drawing.Image.FromFile(Server.MapPath("uploads//")+"big"+id+".jpg");

            System.Drawing.Image bmp1 = img1.GetThumbnailImage(116, 82, null, IntPtr.Zero);
            bmp1.Save(MapPath("uploads//")+"small"+id+".jpg");
            ThumbnailImage.ImageUrl = "uploads//"+"small"+id+".jpg";
        }
        catch (Exception exc){
            Span1.InnerHtml = "Error saving file" + "big"+id+".jpg" + "" + exc.ToString();
        }

    }

}
</script>
</head>
<body>
<form enctype="multipart/form-data" runat="server">
  <p>File to Upload:
    <input id="File1" type="file" runat="server">
    <br>
    <input type=button id="Button1" value="Upload" OnServerClick="Button1_Click" runat="server">
</p>
  <p><span id=Span1 style="font: 8pt verdana;" runat="server" /></p>
</form>
</body>
</html>

Here is the error i'm getting:

Compiler Error Message: CS0103: The name 'ThumbnailImage' does not exist in the current context

Member 9357549 · Answer 3 · 2012-08-15T03:27:00

Just removed the offending line and it seems to be working.

Here is my working code incase anyone is interested:

XML

<%@ Page Language="C#" AutoEventWireup="True" %>

<html>
<head>
<script language="C#" runat="server">
// UPLOAD ORIGINAL IMAGE WITH NEW FILE NAME
void Button1_Click(object Source, EventArgs e){
string id = Request.QueryString["id"];
Response.Write (id);
    if (File1.PostedFile != null){
        try{
            File1.PostedFile.SaveAs(Server.MapPath("uploads//")+"big"+id+".jpg");
            Span1.InnerHtml = "File uploaded successfully: "+"big"+id+".jpg";

            System.Drawing.Image img1 = System.Drawing.Image.FromFile(Server.MapPath("uploads//")+"big"+id+".jpg");

            System.Drawing.Image bmp1 = img1.GetThumbnailImage(116, 82, null, IntPtr.Zero);
            bmp1.Save(Server.MapPath("uploads//")+"small"+id+".jpg");
            //ThumbnailImage.ImageUrl = "uploads//"+"small"+id+".jpg";
        }
        catch (Exception exc){
            Span1.InnerHtml = "Error saving file" + "big"+id+".jpg" + "" + exc.ToString();
        }

    }

}
</script>
</head>
<body>
<form enctype="multipart/form-data" runat="server">
  <p>File to Upload:
    <input id="File1" type="file" runat="server">
    <br>
    <input type=button id="Button1" value="Upload" OnServerClick="Button1_Click" runat="server">
</p>
  <p><span id=Span1 style="font: 8pt verdana;" runat="server" /></p>
</form>
</body>
</html>

C# .net - Need help create thumbnail

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