Send data to WEB API Controller in ASP.Net MVC using jQuery AJAX

i do not want create model class for data i directly send data to webapi controller, but not work mens in api controller not hit.

[AcceptVerbs("GET", "POST")]
public HttpResponseMessage Getcourses(string pid, string pname)
{
    DataTable dt = new DataTable();
    string query = "[usp_tbl_parentcourse]";
    using (SqlConnection con = Connection.getConnection())
    {
        using (SqlCommand cmd = new SqlCommand(query, con))
        {
            cmd.Parameters.Clear();
            cmd.Parameters.AddWithValue("@pcourseid", SqlDbType.Int).Value = pid;
            cmd.Parameters.AddWithValue("@pcoursename", SqlDbType.NVarChar).Value = pname;
            cmd.Parameters.AddWithValue("@widget_image", SqlDbType.NVarChar).Value = "";
            cmd.Parameters.AddWithValue("@icon_image", SqlDbType.NVarChar).Value = "";
            cmd.Parameters.AddWithValue("@addedon", SqlDbType.DateTime).Value = System.DateTime.Now;
            cmd.Parameters.AddWithValue("@addedby", SqlDbType.NVarChar).Value = "Admin";
            cmd.Parameters.AddWithValue("@updatedon", SqlDbType.DateTime).Value = System.DateTime.Now;
            cmd.Parameters.AddWithValue("@updatedby", SqlDbType.NVarChar).Value = "Admin";
            cmd.Parameters.AddWithValue("@deletedon", SqlDbType.DateTime).Value = System.DateTime.Now;
            cmd.Parameters.AddWithValue("@deletedby", SqlDbType.NVarChar).Value = "Admin";
            cmd.Parameters.AddWithValue("@sts", SqlDbType.NVarChar).Value = "a";
            cmd.Parameters.AddWithValue("@flag", SqlDbType.NVarChar).Value = "SA";
            con.Open();
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter sdr = new SqlDataAdapter(cmd);
            sdr.Fill(dt);
            cmd.Connection = con;
            con.Close();

        }
    }

    if (dt.Rows.Count <= 0)
    {
        dt.Clear();
        dt.Columns.Add("error", typeof(System.String));
        dt.Columns.Add("msg", typeof(System.String));

        DataRow _ravi = dt.NewRow();
        _ravi["error"] = "false";
        _ravi["msg"] = "Not Found";
        dt.Rows.Add(_ravi);
        dt.AcceptChanges();
    }
    else
    {
        dt.Columns.Add("error", typeof(System.String));
        dt.Columns.Add("msg", typeof(System.String));

        foreach (DataRow row in dt.Rows)
        {
            row["error"] = "True";
            row["msg"] = "Found";
        }
        dt.AcceptChanges();

        dt.Columns.Remove("addedon");
        dt.Columns.Remove("addedby");
        dt.Columns.Remove("updatedon");
        dt.Columns.Remove("updatedby");
        dt.Columns.Remove("deletedon");
        dt.Columns.Remove("deletedby");
        dt.Columns.Remove("sts");
        dt.Columns.Remove("icon_image");
        dt.Columns.Remove("widget_image");

        dt.Columns["icon_image1"].ColumnName = "image";

        dt.AcceptChanges();
    }

    var jresp = JsonConvert.SerializeObject(dt, Formatting.Indented);
    var r = Request.CreateResponse(HttpStatusCode.OK, "Success");
    r.Content = new StringContent(jresp, Encoding.UTF8, "application/json");

    return r;
}

$.ajax({
    type: "POST",
    url: "/api/jyotish/adminlogin",
   data: JSON.stringify({ 'subcatid': subcatid}),
    contentType: "application/json; charset=utf-8",
    dataType: "json",
    success: function (response) {
        alert(response);
    },
    failure: function (response) {
        alert(response.responseText);
    },
    error: function (response) {
        alert(response.responseText);
    }
});