How to add a message box into a class in asp.net web forms

Question

 

 

 I have created a class and when i'm going to add a message box it show me errors on "Response". How can  fix it.

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

using System.Web.UI;

namespace Food_Calorie_Calculator__Final_Project.Consultant

{

public class ConsultantRegistraion

{

public void Con_Reg()

{

string strcon = ConfigurationManager.ConnectionStrings["dbconnection"].ConnectionString;

SqlConnection con = new SqlConnection(strcon);

try

{

con.Open();

SqlCommand cmd = new SqlCommand("insert into AdminConsultantConfirmation_tb() values()", con);

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

cmd.Parameters.AddWithValue("@", );

SqlDataAdapter da = new SqlDataAdapter(cmd);

cmd.ExecuteNonQuery();

Response.write("Data is not inserted");

}

catch (Exception ex)

{

Response.write("Data is not inserted");

con.Close();

}

finally

{

}

}

}

}