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API call going in timeout from windows forms working fine from Postman

I am trying to call API from windows forms its going in timeout. but its working fine from POSTMAN app.
I am using below code for calling web API from windows app.
public string ReadXMLResponse(string strrequestxml, string strTallyServer1)
{
string URL = strTallyServer1;
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(URL);
myHttpWebRequest.Accept = "application/xml";
myHttpWebRequest.ContentType = "application/xml";
myHttpWebRequest.Timeout = 60000;
string method = "POST";
myHttpWebRequest.Method = method;
if (method == "POST")
{
using (var streamWriter = new StreamWriter(myHttpWebRequest.GetRequestStream()))
{
streamWriter.Write(strrequestxml);
streamWriter.Flush();
}
}
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
using (var streamReader = new StreamReader(myHttpWebResponse.GetResponseStream()))
{
var streamRead = streamReader.ReadToEnd().Trim();
return streamRead;
}
return "";
}

I had the same code and the same problem. It was driving me crazy till I found something on one of Microsoft blogs. Tried to google the original page but I couldn't find it.
WebRequest request = WebRequest.Create("URL");
request.Method = "POST";
var postData = string.Format(dataFormnat, Uri.EscapeDataString(data.Serialize()));
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
reader.Close();
dataStream.Close();
response.Close();

Get jsonp data by webapi

I use HttpRequest object to get data from a webapi which repose Jsonp data.But the responseFromServer object is empty although Chrome Network shows it indeed repose data back.Here is My Code(c#).Greatly appreciated.
WebRequest request = WebRequest.Create(url);
request.Method = "post";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/json";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
var status = ((HttpWebResponse)response).StatusDescription;
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();

How to send HttpRequest(string) and then Receive answer in C#

I need to implement an application to post string like HttpRequest to specify IP address and then receive answer in httpRespons form.
Here is code for sending
WebRequest request = WebRequest.Create("http://192.168.1.10");
request.Method = "POST";
string postData = "string I want to post";
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
I'm not able to test this code. Is this code OK?
Here is code for receive answer:
WebResponse response = request.GetResponse();
richTextBox1.AppendText(((HttpWebResponse)response).StatusDescription);
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
richTextBox1.AppendText(responseFromServer);
reader.Close();
dataStream.Close();
response.Close();
Is this code OK?

The code is correct,but i think StreamReader reader = new StreamReader(dataStream); should append Encoding :StreamReader reader = new StreamReader(dataStream,encoding);

How to use Web Request/Web Response?

By using web request/response classes, i ma trying to login into Pinterest website.. But i am not able to do that as it is giving me 'csrf error'.
Below is my code.
WebRequest request = WebRequest.Create("https://www.pinterest.com/login");
request.Credentials = new NetworkCredential("myid", "mypassword");
request.Method = "POST";
string postData = "This is a test that posts this string to a Web server.";
byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(postData);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
Console.ReadLine();
reader.Close();
dataStream.Close();
response.Close();
what i am doing wrong here ?

This property cannot be set after writing has started! on a C# WebRequest Object

I want to reuse a WebRequest object so that cookies and session would be saved for later request to the server. Below is my code. If i use Post function twice on the second time at
request.ContentLength = byteArray.Length;
it will throw an exception
This property cannot be set after writing has started!
But as you can see
dataStream.Close();
Should close the writing process! Anybody knows what's going on?
static WebRequest request;
public MainForm()
{
request = WebRequest.Create("http://localhost/admin/admin.php");
}
static string Post(string url, string data)
{
request.Method = "POST";
byte[] byteArray = Encoding.UTF8.GetBytes(data);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
WebResponse response = request.GetResponse();
Console.WriteLine(((HttpWebResponse)response).StatusDescription);
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
reader.Close();
dataStream.Close();
response.Close();
request.Abort();
return responseFromServer;
}

You cannot reuse the WebRequest. Take the returned HttpWebResponse.Cookies, construct a new WebRequest and fill the HttpWebRequest.CookieContainer. (You need to assign a CookieContainer in the first request to get Cookies returned.)