posback url

hello,

I was testing my postback and it is not working all the time I get the url visitId =1

/evaluation.aspx?r=25&e=1

need help

try
        {
            myConnection.Open();
            cmd3.ExecuteNonQuery();
            cmd0.CommandType = System.Data.CommandType.Text;
            txtEvaluationVisitID.Text = cmd0.ExecuteScalar().ToString();
 
        }
        catch (Exception exc)
        {
            lblMessage3.Text = exc.Message;
        }
 
        finally
        {
            Response.Redirect("evaluation.aspx?r=" + Request.QueryString["r"] + "&e=" + txtEvaluationVisitID.Text);
            myConnection.Close();
        }

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