How to calculate image size of uploaded image

While in ASP.NET how can I get the attributes of a JPG file so I can determine what the height and width of the picture file is?
 
Following sample code shows how to get height and width of uploaded image.
 
Run live sample code   
<%@ Page Language="C#"%>
<%@ Import Namespace="System.Drawing"%>
<script runat="server">
    void SubmitBtn_Click(object sender,EventArgs e){
        if (ImageUpload.PostedFile.ContentLength != 0){
            try{
                Bitmap uploadedimage =
				
				
				new Bitmap(ImageUpload.PostedFile.InputStream);
                MessageLbl.Text = 
                    String.Format("Image Height: {0} and Image Width: {1}",
                    uploadedimage.Height,uploadedimage.Width);
            }catch(Exception ex){
                MessageLbl.Text ="Uploaded file is not Image";
                
            }
        }
    
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <p>Upload image to get its size</p>
        <p>
            Upload Image 
            <br />
            <asp:FileUpload ID="ImageUpload" runat="server"/>
        </p>
        <p>
            <asp:Button ID="SubmitBtn" runat="server" Text="Submit" 
                OnClick="SubmitBtn_Click"/>
        </p>
    </div>
    <asp:Label runat="server" ID="MessageLbl" ></asp:Label>
    </form>
</body>
</html>
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