I am getting error while calling website URL through C# code. The error is 500 internal server error at getresponse()

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C#3.5

while calling url using httpwebrequest create(url) method i am getting error as

The remote server returned an error: (500) Internal Server Error

//Here is the code

string downloadurl=""http://Localhost:1005/Checker.mvc?lvl=s3cr3tkeySTX&user=ITB-Testing&company=ITBright&country=BE&warp=pu";
try
{

Uri url = new Uri(downloadurl);
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url); //)System.Net.WebRequest.Create(url);
System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
response.Close();

}

What I have tried:

try
{
// string UrlForDownload = DownloadUrl;
Uri url = new Uri(downloadurl);
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(url); //)System.Net.WebRequest.Create(url);
System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
response.Close();

}

This above code i tried