A better way to validate URL in C# than try-catch?

Question

I\'m building an application to retrieve an image from internet. Even though it works fine, it is slow (on wrong given URL) when using try-catch statements in the applicatio

Answer 1

Hi you validate https http,ftp,sftp,ftps,any thing starting with www.

string regular = @"^(ht|f|sf)tp(s?)\:\/\/[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&%\$#_]*)?$";
string regular123 = @"^(www.)[0-9a-zA-Z]([-.\w]*[0-9a-zA-Z])*(:(0-9)*)*(\/?)([a-zA-Z0-9\-\.\?\,\'\/\\\+&%\$#_]*)?$";

string myString = textBox1.Text.Trim();
if (Regex.IsMatch(myString, regular))
{
    MessageBox.Show("It is valide url  " + myString);
}
else if (Regex.IsMatch(myString, regular123))
{
    MessageBox.Show("Valide url with www. " + myString);
}
else 
{
    MessageBox.Show("InValide URL  " + myString);
}