Insert Data into SQL DataBase

Question

Dear all,

I try to insert data into my Database but when I click the button nothing happen I tried to use select statement instead of insert statement and it works well, but when I try ti update or insert data nothing happens, could anybody help me with that?

This is the code:

SqlConnection con = new SqlConnection();
SqlCommand cmd = new SqlCommand();

    con.ConnectionString = @"Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\nobel.mdf;Integrated Security=True;User Instance=True";
    con.Open();
    cmd.CommandText = "INSERT INTO test VALUES (@amount, @description)";
                cmd.Parameters.AddWithValue("@amount", Convert.ToInt64(txt_amount.Text));
                cmd.Parameters.AddWithValue("@description", rtxt_description.Text);
                cmd.Connection = con;
                cmd.ExecuteNonQuery();
                con.Close();