Wait for a Thread to Finish in C#

To wait for a thread to finish in C# we can use one of 2 ways:

1) Using Task.WaitAll() method
2) Using Thread.Join() method

1) Using Task.WaitAll() method

This method waits for all of the provided Task objects to complete execution, this method requires including namespace: using System.Threading.Tasks;

Example

using System;
using System.Threading.Tasks;

public class Program
{
	static void function1() {
		for(int i = 0; i < 4; i++)
		{
			Console.WriteLine("Thread function 1");
		}
	}
	
	static void function2() {
		for (int i = 0; i < 4; i++)
		{
			Console.WriteLine("Thread function 2");
		}
	}

	public static void Main()
	{
		Task thread1 = Task.Factory.StartNew(() => function1());
		Task thread2 = Task.Factory.StartNew(() => function2());
		Task.WaitAll(thread1, thread2);
		Console.WriteLine("End of Main function.");
	}
}

Output

Thread function 1
Thread function 1
Thread function 1
Thread function 1
Thread function 2
Thread function 2
Thread function 2
Thread function 2
End of Main function.

Using Thread.Join() method

This method blocks the calling thread until the thread represented by this instance terminates, this method requires including namespace: using System.Threading;

Example

using System;
using System.Threading;

public class Program
{
	static void function1() {
		for(int i = 0; i < 4; i++)
		{
			Console.WriteLine("Thread function 1");
		}
	}
	
	static void function2() {
		for (int i = 0; i < 4; i++)
		{
			Console.WriteLine("Thread function 2");
		}
	}

	public static void Main()
	{
		Thread thread1 = new Thread(new ThreadStart(function1));
		Thread thread2 = new Thread(new ThreadStart(function2));
		thread1.Start();
		thread1.Join();
		thread2.Start();
		thread2.Join();
		
		Console.WriteLine("End of Main function.");
	}
}

Output

Thread function 1
Thread function 1
Thread function 1
Thread function 1
Thread function 2
Thread function 2
Thread function 2
Thread function 2
End of Main function.

Wait for a Thread to Finish in C#

1) Using Task.WaitAll() method

Example

Output

Using Thread.Join() method

Example

Output

Conclusion