>I did put a debug.writeln("tick fired") but it was never displayed in the debug output window, so the tick code isn't executed.
>
>I know that the code that enables the timer is running, as it also changes the text of a label, and changes the background color of the custom control.
>
>OK, here's some of the code. It's my first ever C# application, so may be a little disorganised.
>
>First, the event handler that gets called whenever the state of a phone line changes.
>clsLine manages the interface to the actual phone system, and raises events when calls come and go.
>The code must allow for a variable number of physical phone lines, so at application startup, the number of lines
>is detected and a corresponding number of clsLine and CtlPhoneLine1 (on-screen representation) objects
>are created.
>When the state of a phone line changes, this code then loops through the controls on the form to find the
>correct matching on-screen representation of the appropriate phone line (by matching Index property).
>Do let me know if there is a better way of doing this.
>This code is a method on the main form
>

>      private void OnLineStatChg(object sender, EventArgs e)
>        {
>            //This event handler fires whenever the status of a clsLine (phone line) changes
>            //Find the corresponding screen line representation, then call the refresh code, below.
>  
>            //I added the following line for debugging and it does display the text
>            if (this.InvokeRequired == true) Debug.WriteLine("Invoke Required");
>
>            clsLine theline = (clsLine) sender;
>            foreach (CtlPhoneLine1 obj in this.Controls)
>            {
>                if (obj is CtlPhoneLine1)
>                {
>                    if (obj.Index == theline.Index)
>                    {
>                        this.RefreshLine(theline, obj);
>                        goto FoundIt;
>                    }
>                }
>            }
>            FoundIt:
>            return;
>        }
>

>
>Once the correct CtlPhoneLine1 is found, another form method is called to make the actual changes.
>

>       private void RefreshLine( clsLine LineObj, CtlPhoneLine1 LineCtl)
>        {
>            //This code sets the properties of the appropriate ctlPhoneLine control
>            //When a call enters or leaves the queue.
>            LineCtl.CallerId = LineObj.Callerid;
>            LineCtl.CallerIdName = LineObj.Callername;
>            switch (LineObj.State)
>            {
>                case LineState.LineClear:
>                    LineCtl.Status = "Clear";
>                    break;
>                case LineState.LineRinging:
>                    LineCtl.Status = "Ringing";
>                    break;
>                case LineState.lineHungup:
>                    LineCtl.Status = "Hungup";
>                    break;
>            }
>        }
>

>
>CtlPhoneLine1 is my custom control.
>In the Set method of the Status property of CtlPhoneLine1, the code that adjusts the appearance of various parts of the control runs.
>

>        public string Status
>        {
>            get
>            {
>                return this._status;
>            }
>            set
>            {
>                this._status = value;
>                //Call a method to re-set control appearance based on state
>                this.SetAppearance(this._status);
>            }
>        }
>

>
>And finally, the CtlPhoneLine1 SetAppearance method makes the changes.
>

>       private void SetAppearance(string state)
>        {
>            switch (state)
>            {
>                case "Ringing":
>                    tmrFlash.Start();
>                    lblStatus.Text = state;
>                    this.BackColor = Color.Red;
>                    break;
>                case "Hungup":
>                    tmrFlash.Stop();
>                    lblStatus.Text = "Available";
>                    this.BackColor = Color.Yellow;
>                    break;
>                case "Clear":
>                    tmrFlash.Stop();
>                    lblStatus.Text = "Available";
>                    this.BackColor = Color.Yellow;
>                    break;
>            }
>        }
>

>
>On my form, I was able to reference an Enum that I create for LineState, but notice that I had to then change that to a string when passing through to the CtlPhoneLine1 control. This is because I developed the control as a seperate project (added as part of the whole solution), but I can't seem to access classes and types created as part of the main solution from within CtlPhoneLine1. I have tried adding a using.. of r the main project namespace but it didn't work - any suggestions here too would be useful.
>
>Thanks,

I just sent you a private email.
Tim