C# framework 3.5:how wait multiple threads to complete?

C# framework 3.5:how wait multiple threads to complete?for example I have three threads and I want to wait to complete all (3 threads);
if (_couponCounter >= Constants.PacketProcessedcoupons || NoCouponFound == true)
                    {
                        StoredProceduresData._1 = new Thread(new   ThreadStart(StoredProceduresData.CallSpInsertColumns_1));
                        StoredProceduresData._2 = new Thread(new ThreadStart(StoredProceduresData.CallSpInsertColumns_1));
                        StoredProceduresData._30 = new Thread(new ThreadStart(StoredProceduresData.CallSpInsertColumns_1));
                        StoredProceduresData._1.Start();
                        StoredProceduresData._2.Start();
                        StoredProceduresData._30.Start();
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
//....Wait  until to complete ALL 3 threads...
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!                        
                       // StoredProceduresData.CallSpInsertColumns();
                        
                        _couponCounter = 0;
                    }

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nikavakAsked:
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DhaestCommented:
A way to solve it:
1. Create and start the threads. Each thread increments a synchronized global thread counter.

2. Have each thread signal that is is finished by decrementing the global counter.

3. Put the main process on a timer that periodically tests the counter, and idles the rest of the time. When the count gets to zero, take the next action.
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Rahul Goel ITILSenior Consultant - DeloitteCommented:
You can use the BackgroundWorker Threads instread of normal threads, it will intimate you when it endns and what is progress.
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DhaestCommented:
Thread..::.Join Method

Blocks the calling thread until a thread terminates, while continuing to perform standard COM and SendMessage pumping.

http://msdn.microsoft.com/en-us/library/95hbf2ta.aspx


StoredProceduresData._1.Join();
StoredProceduresData._2.Join();
StoredProceduresData._30.Join();
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nikavakAuthor Commented:
Thanks a lot
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