C#

t.Join()

[OperationContract]
public string GetData(int value)
{
    for (int i = 0; i < 4; i++)
    {
        Thread t = new Thread(() => simpleThread(i));
        t.Start();
    }
    // Since the signature of this method is String GetData(int)
    // This will never pass the compilation process as the method
    // needs to return a String
}

[OperationContract]
public string GetData(int value)
{
    for (int i = 0; i < 4; i++)
    {
        Thread t = new Thread(() => {
             int j = i;       // not quite sure if this is needed,
                              // but try leaving it out and see what happens.
             simpleThread(j); // if you leave out the above statement change j to i on this line
        });
        t.Start();
    }
    return ""; // An empty string is also a string ;)
}

3 : 3
3 : 3
3 : 3
4 : 4

ParameterizedThreadStart pt = new System.Threading.ParameterizedThreadStart(simpleThread);
          Thread t = new System.Threading.Thread(pt);
          t.Start(i);

0 : 0
2 : 2
3 : 3
1 : 1

VKAnanth wrote:

May be we can't expect this in the right order? as they are "Threads!"?

for (int i = 0; i < 4; i++)
{
    Thread t = new Thread(() => simpleThread(i));
    t.Start();
}

Thread t = new Thread(() => {
    for (int i = 0; i < 4; i++) {
        simpleThread(i);
    }
});
t.Start();

VKAnanth wrote:

And the problem is random