Very Interesting Event handling Challenge

Question

1. Custom Control with 2 Textboxes
Publicly define Int Sum = textbox1 + textbox2 values
2. A new Form and Add the Custrom Control created
A third Textbox which will take value from CustromControl.Sum

The Tricky issue is , Event Should Occur when ever the Textbox1 and Textbox2 values are changed in the Form . and Textbox 3 should get automatically updated.

can anyone who's done this help me with this ?? Its something I've tried using A delegates and events but its never getting invoked in the main form .

Any Help would be appreciated

Thanks

Frogleg · Answer

Hey Mayur, you can get a convertor here http://www.cultiv.nl/blog/2010/3/16/convert-between-vs2008-and-2010-projects,-automatically

Mayur Gujrathi · Answer

Frogleg code you have provided do not run in vs 2008 can you provide for same

Sam Hobbs · Answer

I am sorry, but no; the problem is still not clear. I think the solution would be easy if the requirements were adequately described.

Vivek Sampara · Answer

A project which has multiple locations where values of 2 text boxes are added to Another Textbox or label. So Instead of Writing the code of each and every location, A friend of mine suggested to use a custom control . So This custom control has 2 Text boxes. If there's any change of value in either of the textbox there should be an Event Triggered in the form we're using this custom control. So Event For Textbox.TextChanged doesn't exist for custom Control, To trigger the main form. So i've used the code i've mentioned . So when event the textbox value is changed , the main form gets triggerd Hope you understood now . public void CustomControlValueChange(object sender, EventArgs e) { Textbox3.Text = customcontrol1.Sum.toString(); MessageBox.Show("TRIGGERED IN MAIN FORM "); }

Sam Hobbs · Answer

I think the biggest challenge is to get you to describe the requirements clearly. I am still not sure of the important details. It is not clear to me how many forms are involved. Beginners tend to talk in terms of project s. Experienced Windows developers don't. In this context, a project can be another application and therefore some kind of inter-process communication is necessary. That is not a typical Windows Forms thing and is very different from an intra-process solution. A project could be a class library which executes within a process and would not need inter-process communication.

Vivek Sampara · Answer

Frogleg , Thanks for you reply, It really helped me a lot but ,But I got it working in this method Sam Hobbs , I put up the word as a challenge, 1. I've consulted a few very good .NET programmers and i dint find any results for that , so it would be something for the experts of C sharp corner can try. 2. Yes i my intend was to get the result as it would be very useful for me and others who are working on Custom Events and Delegates . Thanks For the Reply Guys -- public event TextBoxControl_TextChangedEventHandler MyEvent; public delegate void TextBoxControl_TextChangedEventHandler(System.Object sender, System.EventArgs e); private void textbox_TextChanged(System.Object sender, System.EventArgs e) { if (MyEvent != null) { MyEvent(sender, e); } } And in the Form im using the custom Contol. I used this this.newControl11.MyEvent += new NewControl1.TextBoxControl_TextChangedEventHandler(CustomNewChange);

Sam Hobbs · Answer

Note that I usually avoid questions that say "challenge". You can put that in the subject if you want to but note that I might ignore it. If I am the only one then it might be not problem but I think that many people that volunteer to help others might feel it that saying "challenge" intended to get results that would not otherwise happen and don't want to reward that. You probably did ntointend to do that so that is why I am explaining it. I am not sure if you are saying that there is just one form or two forms. Is it one form with a UserControl and a textbox in it and the UserControl has two textboxes?

Frogleg · Answer

Different projects

Vivek Sampara · Answer

This is Almost the same, But the issue is, Both the Control and the Form are from the same project. But this control should be able to be added in another project. And An event trigger must occur when the Textbox values are changed . As you have used the object in the same object you dont have to make any delegates .

Frogleg · Answer

Try this

Vivek Sampara · Answer

Is there anyone who can help ?? i've Tried using almost all the possible tutorials on the INTERNET . Someone who's experienced can try to help ..

Vivek Sampara · Answer

A Visual Studio Application will be really helpful for me to learn.