How to Encode the username and Pwd to NTLM authentication

Question

Hi,

 

 

string username = AHD.username;

string password = AHD.password;

var plainTextBytes = System.Text.Encoding.UTF8.GetBytes(username + ":" + password);

string encodedCredentials = System.Convert.ToBase64String(plainTextBytes);

string authorization = String.Concat("SDM", encodedCredentials);

 

 

The above code i am using for SDM encoded credentials but i am getting the basic authentication. 

 

In the way i need NTLM authentiction values as i am getting the values in postman but not in coding. what approch is used to get NTLM as like Basic authentication