Why I can not executed a postasync in my APP

See more:

C#

Android

API

Hello
The following Code works on another part, but here when the postasync it is executed its return to the try again and again. Any Help pls?

#if DEBUG
	HttpClientHandler insecureHandler = DependencyService.Get<ihttpclienthandlerservice>().GetInsecureHandler();
	HttpClient client = new HttpClient(insecureHandler);
#else
	HttpClient client = new HttpClient();
#endif
	var data = new FormUrlEncodedContent(new[]
	{
		new KeyValuePair<string, string="">("FechaRegistro",  p0),    
		new KeyValuePair<string, string="">("TipoGasto", p2),
		});
	try
	{
		string url = "https://10.0.2.2:7254/api/PostData/postTransacciones";       
		client.BaseAddress = new Uri(url);
		var response = await client.PostAsync(url, data); 
		if (response.IsSuccessStatusCode)
// incomplete

What I have tried:

I had checked Api Manual, c# tutorial and other part of my app where it is working