Extract information from inside a private event handler

Question

Hello all Need some help in my first Win Form application. A key click event handler works fine internally as a private method. Unfortunately I don't know how I can extract the information out of the private event handler. I need the 'keynum' paramater outside the method. A return parameter is not accepted in the event handler (The relevant hidden delegate is set void?) The error is: byte WindowsFormsApplication4.Form1.Key_Click(object System.EventArgs)' has the wrong return type Sam private void Key_Click( object sender EventArgs e) { Button currentkey = ( Button )sender; //remove the word 'Key' from the name like from 'Key05' string currentKey = currentkey.Name.Remove(0 3); byte keynum = Convert .ToByte(currentKey); textBox1.Text = Convert .ToString(keynum); }

Sam · Answer

Thaks Roie. I did as you suggested and it works now (after making the field private and adding getter and setter properties). Another question: I have a small rich textbox printing method in my Form1 class. When I call it from another class with a parameter it prints null. The reason I found to be the initialization of the text box each time I call its class. (When i do the same printing from within Form1 it work perfect). What am I doing wrong? Thanks. in a class: Form1 form1 = new Form1 (); form1.Display(z); in Form1 class: public void Display( double number) { richTextBox1.AppendText( Convert .ToString(number)); }

Roei Bar · Answer

here is a code sample: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { byte keynum = null; public Form1() { InitializeComponent(); } private void Key_Click(object sender EventArgs e) { Button currentkey = (Button)sender; //remove the word 'Key' from the name like from 'Key05' string currentKey = currentkey.Name.Remove(0 3); this.keynum = Convert.ToByte(currentKey); textBox1.Text = Convert.ToString(keynum); } } } hope this helps

Sam · Answer

Thanks Roie for your support. Can you please elaborate on : Just put the byte keynum variable in the Application scope and not in the event scope. How? The automatic C# event handler is Private void. Thanks Sam

Roei Bar · Answer

if this is a single Thread Application just put the byte keynum variable in the Application scope and not in the event scope. hope this helps