C#url shortener

Question

I’m adjusting a code in c# for a url shortener api to send in the sms inside an application, it’s all working, but the out-of-code api works, but within the code the Return comes back nothing, I’m not very experienced in c#, can anyone help me? Follows the code:

public static class Helpers
{
    public static string EncurtadorUrl(string url)
    {
        try
        {
            string urlMigreMe = string.Format("http://tiny-url.info/api/v1/create?url={0}&apikey={APIKEY}chave_aqui&provider=bit_ly");

            var client = new WebClient();
            string response = client.DownloadString(urlMigreMe);

            return response;
        }
        catch 

        {
            return "";
        }

Answer 1

The code is working perfectly. Just make sure you pass a valid URL, for example:

        string urlMigreMe = string.Format("http://tiny-url.info/api/v1/create?url=http://google.com&apikey=APIKEYAQUI&provider=bit_ly");

        var client = new WebClient();
        string response = client.DownloadString(urlMigreMe);

In this example using the google url, the return value obtained was:

http://tw.gs/4Yudb2

Editing

To pass the url by parameter, do so:

string urlMigreMe = string.Format("http://tiny-url.info/api/v1/create?url=
                                   {0}&apikey={APIKEY}&provider=bit_ly", URL AQUI);

Answer 2

Wrong or improper use of the method class format String that is wrong: when you want to format a string, put the numbering of 0 until the amount in case there are two, then, {0} and {1}

See code editing:

public static class Helpers
{
    public static string EncurtadorUrl(string url)
    {
        try
        {                
            string urlMigreMe = string.Format("http://tinyurl.com/api-create.php?url={0}", url);

            var client = new WebClient();

            string response = client.DownloadString(urlMigreMe);

            client.Dispose();

            return response;
        }
        catch (WebException ex)
        {
            throw ex;
        }
    }

    public static string EncurtadorUrl(Uri url)
    {
        return EncurtadorUrl(url.AbsoluteUri);
    }
}

Way to use:

class Program
{
     static void Main(string[] args)
     {
          string url = Helpers.EncurtadorUrl(new Uri("http://www.uol.com.br"));
          //dado contido na variavel url coloque no navegador vai abrir a pagina
     }
}

String.Format Method