How to get cookie and send cookie with request , with respect to webBrowser Control in c#

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C#

Windows

application

HTTPS

How can i get cookie from webBrowser1 control of c#.

string username = "myusername";
        string password = "pwd";
        string loginOp="log";
            string client="pref";


 // format our data that we are going to post to the server

 // this will include our post parameters.  

 string postData = string.Format("loginOp={0}&username={1}&password={2}&client={3}",loginOp,username,password,client);

 ASCIIEncoding enc = new ASCIIEncoding();



 //  we are encoding the postData to a byte array

 webBrowser1.Navigate("https://MainWebsite/y/search?mesg=hell0&initial=false&app=", "", enc.GetBytes(postData), "Content-Type: application/x-www-form-urlencoded");

post parameters can be send like above code , how can i send cookie with this request.