Trying to detect whether an url link is valid or not

[colol]

Good morning, does anyone know how to detect whether a url link is valid or not. I was ask to create a function that detects whether a url link is valid or not, and if it is not valid then certain actions take place, but for now i am not sure how to detect the url, i have tried many coding but it seems to not work at all. please help me!!

[PsychoCoder]

By 'valid' do you mean it's formatted correctly it a URL that actually exists? You say you've tried some coding but cannot get it to work, show us what you've tried and it'll be easier for us to help.

[colol]

This is the coding i did, but whether it's only http or with www, it only displays Invalid URL. eg. https://www.google.com.my/ & http://forums.asp.net/

protected void Page_Load(object sender, EventArgs e)
    {

        Uri url = new Uri("http//...");
        WebRequest request = WebRequest.Create(url);
        request.Method = "HEAD";
        WebResponse r;

        try
        {
            r = request.GetResponse();
            r.Close();
            Response.Write("Valid URL");
        }
        catch (Exception)
        {
            Response.Write("Invalid URL");
        }

    }

[PsychoCoder]

Try changing your code to this (it will then show you what's going wrong:

protected void Page_Load(object sender, EventArgs e)
    {
 
        Uri url = new Uri("http//...");
        WebRequest request = WebRequest.Create(url);
        request.Method = "HEAD";
        WebResponse r;
 
        try
        {
            r = request.GetResponse();
            r.Close();
            Response.Write("Valid URL");
        }
        catch (Exception ex)
        {
            //Show the exact error
            Response.Write(ex.ToString());
        }
 
    }

[colol]

another question i have is, is it possible to add gridview inside the try-catch statement, like this:

try 
        { 
            r = request.GetResponse(); 
            r.Close(); 
            GridView1.DataSource = RSS(url);
            GridView1.DataBind();
}
catch (Exception) 
        { 
            Response.Write("Invalid URL"); 
        }