How to see in pgadmin SQL query id value ?

See more:

C#

ASP

SQL

PostgreSQL

I want to see what is query id value, but in pgAdmin shows only $1.
Photo shows how it looks.
Capture.PNG | Failiem.lv.[^]

Code looks like:

// Savienojums ar datu bāzi.
        readonly string CS = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;

        public void ProcessRequest(HttpContext context)
        {
            NpgsqlConnection con = new NpgsqlConnection(CS);
            if (!string.IsNullOrWhiteSpace(context.Request.QueryString["image_id"]))
            {
                string img_id = context.Request.QueryString["image_id"].ToString();
                con.Open();
                string sTSQL = "select image from images where image_id=@image_id";
                NpgsqlCommand cmd = new NpgsqlCommand(sTSQL, con);
                cmd.CommandType = CommandType.Text;
                cmd.Parameters.AddWithValue("@image_id", img_id.ToString());
                object data = cmd.ExecuteScalar();
                con.Close();
                cmd.Dispose();
                context.Response.BinaryWrite((byte[])data);
            }

What I have tried:

I havent find answer how to make postgreslq pgadmin show the value..