Json C# add in the variable to the json string
<p>I want to add my string username and password into the string jsonData however there seems to be an error.    </p>

<pre><code>public async Task&lt;string&gt; authLogin(string username, string password)
    {
        var client = new HttpClient();
        client.BaseAddress = new Uri("http://172.20.129.193/");

        string jsonData = @"{""AdminNo"" : """+username+""", """+password+""" : ""password""}";

        var content = new StringContent(jsonData, Encoding.UTF8, "application/json");
        HttpResponseMessage response = await client.PostAsync("NYPStudentLifeService/api/student/login",content);

        string result = await response.Content.ReadAsStringAsync();
        return result;
    }
</code></pre>