string result = "";

   private void Testing()
            {
 var threadA = new Thread(() => { result += A()+Environment.NewLine; });
                var threadB = new Thread(() => { result += A() + Environment.NewLine; });
                var threadC = new Thread(() => { result += A() + Environment.NewLine; });
                var threadD = new Thread(() => { result += A() + Environment.NewLine; });
                var threadE = new Thread(() => { result += A() + Environment.NewLine; });
                var threadF = new Thread(() => { result += A() + Environment.NewLine; });
                var threadG = new Thread(() => { result += A() + Environment.NewLine; });
                var threadH = new Thread(() => { result += A() + Environment.NewLine; });
                var threadI = new Thread(() => { result += A() + Environment.NewLine; });
                var threadJ = new Thread(() => { result += A()+Environment.NewLine; });

                threadA.Start();
                threadB.Start();
                threadC.Start();
                threadD.Start();
                threadE.Start();
                threadF.Start();
                threadG.Start();
                threadH.Start();
                threadI.Start();
                threadJ.Start();

                threadA.Join();
                threadB.Join();
                threadC.Join();
                threadD.Join();
                threadE.Join();
                threadF.Join();
                threadG.Join();
                threadH.Join();
                threadI.Join();
                threadJ.Join();
    }

private string A()
        {
            for (int i = 0; i <= 10000; i++)
            {
                result += "select * from testing" + Environment.NewLine;
            }
            return result;
        }