On one click event two msg box with yes and no in javascript

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C#2.0

C#

I think, i have not clarified how i want it.

1.How first msg box contain both (yes and no) option, i want exactly like that.Means second msg box also contain msg title and both (yes and no) option.Importantly i have to access that second msg confirmation value.(this happening based on onclientclick event))
2.In first msg box, after confirmation i got confirmation value as below:

if(Addflag==1)
                       string confirmvalue = Request.Form["confirm_value"];//for first msg("are you want to save");
                        if (confirmvalue== "Yes")
                        {
                            con.Close();
                            con.Open();
                            sqlcmd2 = new SqlCommand("INSERT INTO city_name(C_name) VALUES('" + txtbox_city.Text + "')", con);
                            sqlcmd2.ExecuteNonQuery();
                            txtbox_city.Text = string.Empty;
                        }
                        else if (confirmvalue == "No")
                        {
                           msg("cancelled");
                        }
                        }
3.So now i want like that same confirmation value for second msg box like:
                 if(Addflag==1)
                       string confirmvalue = Request.Form["confirm_value"];//for first msg("are you want to save");
                        if (confirmvalue== "Yes")
                        {
                            con.Close();
                            con.Open();
                            sqlcmd2 = new SqlCommand("INSERT INTO city_name(C_name) VALUES('" + txtbox_city.Text + "')", con);
                            sqlcmd2.ExecuteNonQuery();
                            txtbox_city.Text = string.Empty;
                        }
                        else if (confirmvalue == "No")
                        {
                           msg("cancelled");
                        }
                        }
               if (Editflag == 1)
                {
                    string edit_qry = "select * from ledger_details where L_city='" + PrevCname + "'";
                    con.Close();
                    con.Open();
                    sqlcmd2 = new SqlCommand(edit_qry, con);
                    sqlreader2 = sqlcmd2.ExecuteReader();
                    if (sqlreader2.HasRows)
                    {
                        string confirmvalue = Request.Form["confirm_value"]; //second msg("this record in the main table, are you sure to edit this?.");
                        if (confirmvalue == "Yes")
                        {
                            con.Close();
                            con.Open();
                            string edit_update = "Update ledger_details set L_city='" + Cname + "' where L_city='" + PrevCname + "' ";
                            sqlcmd2 = new SqlCommand(edit_update, con);
                            sqlcmd2.ExecuteNonQuery();
                            con.Close();
                            con.Open();
                            string edit_update1 = "Update city_name set C_name='" + Cname + "' where C_ID='" + row_id + "'";
                            sqlcmd2 = new SqlCommand(edit_update1, con);
                            sqlcmd2.ExecuteNonQuery();
                            txtbox_city.Text = string.Empty;
                        }
                        else 
                        {
                             message( "You have cancelled to save the city name..");
                           
                        }
                    }