c# Events

Question

Hi I am trying to implement an event to pass information to another form but am having issues trying to work out how to do it. I have googled c# events and reviewed many of the returned results and they all seem overly complex and hard to understand and implement into the situation that I have. My senario consists of a Main form from this form I open another popup form that shows a list of Contacts. On this form I have a button to add a new contact and when clicked it opens another popup form that shows the add Contact template. What I would like to do is advise the Main form once save has been initiated on the Add Contact Template form. Can anyone please advise and perhaps show a simple example of how to carryout the above. Thanks in Advance Peter

Vulpes · Answer

Here's a basic model for adding a custom event to your Windows Forms project: /* add this class to your project */ class EventBroadCaster { public event EventHandler ContactAdded; public void OnContactAdded(object sender EventArgs e) { ContactAdded(sender e); // broadcast event } } /* make the highlighted change to program.cs */ static class Program { /* create global event broadcaster object */ internal static EventBroadCaster BroadCaster = new EventBroadCaster(); [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } /* add the highlighted line to Form1 just before you open Form2 */ Program.BroadCaster.ContactAdded += this.ContactAdded; // subscribe to event Form2 f2 = new Form2(); f2.ShowDialog(); /* add this handler to Form1 */ private void ContactAdded(object sender EventArgs e) { MessageBox.Show(Contacted added!); } /* add this line to Form3 when a new contact is added */ Program.BroadCaster.OnContactAdded(this EventArgs.Empty); // fire event

Frogleg · Answer

This is one way

Shankar M · Answer

Hi Peter Hope this code project link might help you. http://www.codeproject.com/Articles/17371/Passing-Data-between-Windows-Forms This is one way to Pass data between Forms. You can follow other approaches like Properties Using objects to pass data or constructor approach which suits your need. Thanks M Shankar