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Can anyone please help Ous in converting this code to c# to POST JSON data in CRM online.

package com.sample;

import org.apache.commons.codec.binary.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.io.IOException;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.SimpleDateFormat;
import java.util.Date;

class RegPatient {
private final static String DATE_FORMAT = "EEE, d MMM yyyy HH:mm:ss z";
private final static String HMAC_SHA1_ALGORITHM = "HmacSHA1";

private final static String URL = "https://******.in/";
private final static String Entity = "*************";

//Live Public Key and Secret Key for nani-hospital
private final static String SECRET = "*********************";
private final static String USERNAME = "*************";

private static String sampleJson = "{\"name\":\"Test\",\"lname\":\"Patient\",\"registrationdate\":\"20181210\",\"dob\":\"19840510\",\"gender\":\"M\",\"mobile\":\"0000000000\",\"street\":\"10th cross street\",\"area\":\"\",\"city\":\"\",\"state\":\"\",\"zip\":\"\",\"entitykey\":\"nani-hospital\",\"title\":\"Mr\",\"age\":\"34\",\"maritalstatus\":\"Single\",\"spousename\":\"\",\"spouseage\":\"\",\"idproof\":\"Aadhaar\",\"idproofdetails\":\"1234567890123458\",\"bloodgroup\":\"A+\",\"email\":\"conatactme@xyz.com\",\"contactnumbers\":\"1234567890,0987654321\",\"ptsource\":\"flyers\",\"entitylocation\":\"location1\",\"familyid\":\"\",\"referred_by\":\"\",\"referred_bykey\":\"\",\"extphid\":\"\",\"patienttype\":\"None\",\"tag\":\"\",\"religion\":\"Hindu\",\"fileno\":\"\",\"occupation\":\"Software Engineer\"}";

private static String sampleErrorJson = "{\"name\":\"\",\"lname\":\"Patient\",\"registrationdate\":\"20181210\",\"dob\":\"19840510\",\"gender\":\"M\",\"mobile\":\"\",\"street\":\"10th cross street\",\"area\":\"\",\"city\":\"\",\"state\":\"\",\"zip\":\"\",\"entitykey\":\"nani-hospital\",\"title\":\"Mr\",\"age\":\"34\",\"maritalstatus\":\"Single\",\"spousename\":\"\",\"spouseage\":\"\",\"idproof\":\"Aadhaar\",\"idproofdetails\":\"1234567890123458\",\"bloodgroup\":\"A+\",\"email\":\"conatactme@xyz.com\",\"contactnumbers\":\"1234567890,0987654321\",\"ptsource\":\"flyers\",\"entitylocation\":\"location1\",\"familyid\":\"\",\"referred_by\":\"\",\"referred_bykey\":\"\",\"extphid\":\"\",\"patienttype\":\"None\",\"tag\":\"\",\"religion\":\"Hindu\",\"fileno\":\"\",\"occupation\":\"Software Engineer\"}";

public static void main(String[] args) throws HttpException, IOException, NoSuchAlgorithmException {
RegPatient client = new RegPatient();
client.regPatient(USERNAME);
}

public void regPatient(String username) throws HttpException, IOException, NoSuchAlgorithmException {
String contentToEncode = "";
String currentDate = new SimpleDateFormat(DATE_FORMAT).format(new Date());
String contentType = "application/x-www-form-urlencoded";
HttpPost post = new HttpPost(URL + "api/register/patient/" + Entity);

StringEntity params =new StringEntity(sampleJson);

post.addHeader("content-type", contentType);
post.setEntity(params);

String verb = post.getMethod();
String contentMd5 = calculateMD5(contentToEncode);
String toSign = verb + "\n" + contentMd5 + "\n"
+ contentType + "\n" + currentDate + "\n" + "\n"
+ post.getURI().getPath();

String hmac = calculateHMAC(SECRET, toSign);
System.out.println("TEST HASH "+ calculateHMAC(SECRET, "test"));

post.addHeader("authorization", "MD " + username + ":" + hmac);
post.addHeader("date", currentDate);

System.out.println("String To Sign :" + toSign);
System.out.println("hmac:" + hmac);

HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(post);

HttpEntity entity = response.getEntity();
// Read the contents of an entity and return it as a String.
String content = EntityUtils.toString(entity);
System.out.println(content);
System.out.println("\n\n");
System.out.println("client response:" + response.getStatusLine().getStatusCode());
}

private String calculateHMAC(String secret, String data) {
try {
SecretKeySpec signingKey = new SecretKeySpec(secret.getBytes(), HMAC_SHA1_ALGORITHM);
Mac mac = Mac.getInstance(HMAC_SHA1_ALGORITHM);
mac.init(signingKey);
byte[] rawHmac = mac.doFinal(data.getBytes());
String result = new String(Base64.encodeBase64(rawHmac));
return result;
} catch (GeneralSecurityException e) {
throw new IllegalArgumentException();
}
}

private String calculateMD5(String contentToEncode) throws NoSuchAlgorithmException {
if (contentToEncode == "")
return "";

MessageDigest digest = MessageDigest.getInstance("MD5");
digest.update(contentToEncode.getBytes());
String result = new String(Base64.encodeBase64(digest.digest()));
return result;
}
}

Thanks,

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Convert Java code with access key to C# code to POST JSON data

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