Assigning Event Handlers to a C# with Example

BackgroundWorker 
Once the instance of the BackgroundWorker has been declared, it must be given properties and event handlers for 
the tasks it performs. 
/* This is the backgroundworker's "DoWork" event handler. This 
method is what will contain all the work you 
wish to have your program perform without blocking the UI. */ 
bgWorker.DoWork += bgWorker_DoWork; 
/*This is how the DoWork event method signature looks like:*/ 
private void bgWorker_DoWork(object sender, DoWorkEventArgs e) 
{ 
// Work to be done here 
// ... 
// To get a reference to the current Backgroundworker: 
BackgroundWorker worker = sender as BackgroundWorker; 
// The reference to the BackgroundWorker is often used to report progress 
worker.ReportProgress(...); 
} 
 

/*This is the method that will be run once the BackgroundWorker has completed its tasks */ 
bgWorker.RunWorkerCompleted += bgWorker_CompletedWork; 
/*This is how the RunWorkerCompletedEvent event method signature looks like:*/ 
private void bgWorker_CompletedWork(object sender, RunWorkerCompletedEventArgs e) 
{ 
// Things to be done after the backgroundworker has finished 
} 
/* When you wish to have something occur when a change in progress 
occurs, (like the completion of a specific task) the "ProgressChanged" 
event handler is used. Note that ProgressChanged events may be invoked 
by calls to bgWorker.ReportProgress(...) only if bgWorker.WorkerReportsProgress 
is set to true. */ 
bgWorker.ProgressChanged += bgWorker_ProgressChanged; 
/*This is how the ProgressChanged event method signature looks like:*/ 
private void bgWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) 
{ 
// Things to be done when a progress change has been reported 
/* The ProgressChangedEventArgs gives access to a percentage, 
allowing for  easy  reporting  of  how  far  along  a  process  is*/ 
int progress = e.ProgressPercentage; 
}