Check if an image is available on a remote server

I have a URL variable that contains the adress of an image on a remote server (i.e. myVar="http://www.imageserver.com/myImage.jpg");

I do a response.write("<img src='+myVar+'>")

I want to check if the image is really on the remote server to avoid displaying the "red cross" image.

Any idea ?

you can use HttpWebRequest and HttpWebResponse classes to check existence of image on remote server, following code will show how you can do that.

Run sample code
<%@ Page Language="C#" %>
<%@ import Namespace="System.Net" %>
<%@ import Namespace="System.IO" %>
<%@ import Namespace="System.Text" %>

<script runat="server">
    void CheckImage(object sender, EventArgs e){
        HttpWebRequest httpRequest = 
		(HttpWebRequest)WebRequest.Create(text1.Text);
        try {
            HttpWebResponse httpWebResponse = 
		(HttpWebResponse)httpRequest.GetResponse();
            ResponseResult.Text = 
		String.Format("<img src='{0}' />", text1.Text);
        } catch(Exception ex) {
            ResponseResult.Text = ex.Message;
        }
    }
</script>
<html>
<head>
    <title>Check remote image</title>
</head>
<body>
    <form id="Form1" runat="Server">

        <asp:TextBox runat="Server" id="text1"
		Columns="60"
		Text="http://www.jigar.net/quote.ashx?width=150" />
        <p />
        <asp:button ID="Button1"
		runat="Server" onclick="CheckImage" Text="Check"/>
        <p />
        <asp:Literal runat="Server" id="ResponseResult" />
    </form>
</body>
</html>
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