would you please any experience member explain me what is the real scenario in real time you use views and triggers in project.

Question

Hi,

would you please any experience member explain me what is the real scenario in real time you use views and triggers in project. How often you use views and triggers as a programmer.

thanks in advance

arun

Answer 1

Try making the changes I've highlighted:

       private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {            
            string key = string.Empty; / need to reset key to empty each time
           
            try
            {
                if (tab == null) //If Hashtable not yet loaded
                {
                    tab = new Hashtable();//now refers to Field.
                    lines = File.ReadAllLines(path);
                    //The above Statement refers to Fields.

                    foreach (string line in lines)
                    {
                        // This statement refers to field so use if block to search for containing any equality = sign.
                        if (line.Contains("="))
                        {
                            string[] items = line.Split('=');
                            tab.Add(items[0], int.Parse(items[1]));
                        }
                    }
                }                  

                if (tab.ContainsKey(comboBox2.SelectedItem.ToString()))
                {
                    key = comboBox2.SelectedItem.ToString();
                    textBox1.Text = tab[key].ToString();
                }
               
                else
                {
                    MessageBox.Show("Invalid Key or Command Selected....\nPlease Select A Valid Device & Operation");
                }
            }

            catch (Exception Ex)
            {                
                MessageBox.Show(Ex.Message);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(string.IsNullOrEmpty(key)||lines==null) return;

            int code;

            if(!int.TryParse(textBox1.Text,out code))
            {
                MessageBox.Show("You Entered InValid Code.....\nPlease Enter A Valid Code Correctly.");
                textBox1.Focus();
            }

            string search=key+"=";
            int index = -1; // this should be -1

            for (int i = 0; i < lines.Length; i++)
            {
                if (lines[i].StartsWith(search))
                {
                    index=i;
                    break;
                } 
            }

            if(index > -1 && Convert.ToInt32(tab[key])!=code) // this should be index > -1
            {
                lines[index]=search+code.ToString();
                File.WriteAllLines(path, lines);// you should be writing the file, not reading it
                tab[key]=code;
                MessageBox.Show("The Revised Code has been Changed Successfully");
            }
        }