How to subscribe an event from UserControl with Additional parameters?

Question

Hi I've a form frmMain.cs in which I've added a UserControl ucTest.cs. In the usercontrol I've added a button click event in which I'm populating a DataSet ds. Now I need this dataset to be used on the frmMain.cs for manipulation. How do I pass the dataset ds which was updated in the click event of UserControl back to the frmMain.cs ? I tried declare a delegate (i'm totally new to delegates) in the UserControl for this as below -- public delegate Boolean EventHandler(object sender EventArgs args DataSet ds); public event EventHandler evntExecute = delegate {}; In the frmMain.cs I've added a EventHandler function as below -- public Boolean evntExecute_Handler(object sender EventArgs e DataSet ds) { // code using the Dataset ds values } Now how do I exactly subscribe this event in the frmMain.cs ? Thanks.

Sam Hobbs · Answer

I don't see anything in the code you posted here that is  making it as a public member and using it in the calling form . What I do see is an event handler that uses  object sender EventArgs args  when it does not need to. I think there are other problems with the code you posted in the original question here. So I truly believe that there is more to this question than  a way to pass back additional parameters to the handler .

sasikumar · Answer

Hi Sam Thanks for the response. I just wanted to know if there is a way to pass back additional parameters to the handler in the way specified in my earlier post. Tried different options but couldn't find any. Finally I had to stick with the original option of making it as a public member and using it in the calling form. That worked. Thanks.

Sam Hobbs · Answer

Since the parameter (the DataSet) is in the UserControl you do not need to pass it as a parameter for the handler. You can simply make it a public member of the UserControl and then the form can use that to get it. So your delegate can be declared as: public delegate void ClickedEvent(); public ClickedEvent Clicked = null; Then call it from the UserControl click event as: if (Clicked != null) Clicked(); Note that you should check to see if it has been provided a value so that is why we check for null. Then in your form: f.Clicked = controlClicked; And: void controlClicked() { }