How to run these two threads simultaneously

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multi-threading

Below is my code

public class Program
{
public static void Main(string[] args)
{
string[] filePaths = Directory.GetFiles(@"c:\\images\\");
for (int i = 0; i<filepaths.length;>
{
Thread thread1 = new Thread(() => getImageData(filePaths[i], i));
thread1.Start();
}
}
public static void getImageData(string filename, int x)
{
//Process image
}

}

I want to process two images simultaneously to minimize processing time. Above code only starts all the thread but can not give output.If I use thread1.Join() it completes one thread first and starts another. I want to run multiple threads simultaneously. Please give me solution for this.