I searched google for how to validate URL in C# and most results say using a regular expression. Eventually I found Uri.TryCreate which is a built in method in C# to check if a string is a valid URL

Uri uri = null;

if (!Uri.TryCreate(url, UriKind.Absolute, out uri) || null == uri)

{

    //Invalid URL

    return false;

}

 

Reference:

http://msdn.microsoft.com/en-us/library/ms131572(v=VS.90).aspx