http://127.0.0.1:96/Cambia3

http://127.0.0.1/Cambia3

var ip= new Uri("http://127.0.0.1:96/Cambia3");
var withoutPort = string.Format("{0}://{1}/{2}", ip.Scheme, ip.Host, ip.PathAndQuery);

var builder=new UriBuilder("http://127.0.0.1:96/Cambia3");
builder.Port = 80;
Console.WriteLine(builder.Uri.AbsoluteUri);

string str = "http://127.0.0.1:96/Cambia3";
int index1 = str.IndexOf(':', 7);
int index2 = str.IndexOf('/', 7);

str.Remove(index1, index2 - index1);

UriBuilder uri = new UriBuilder("http://127.0.0.1:96/Cambia3");
uri.Port =-1;
string portlessurl = uri.Uri.AbsoluteUri; // Output -- http://127.0.0.1/Cambia3

string ip = "http://127.0.0.1:96/Cambia3";
ip = ip.Replace(":96", string.Empty);