Process is terminated due to StackOverflowException.

Question

I am working on C# Console application of Inheritance,
While running the Console application I am getting message in console "Process is terminated due to StackOverflowException"
I am not getting how to overcome this problem, I studied my code, may be did small mistake, please help me regarding it.
Program.cs
namespace Inheritance
{
class Program
{

static void Main(string[] args)
{
Employee e = new Employee();
Console.WriteLine("Employee");
Console.ReadLine();
}
}
} 
Employee.cs
namespace Inheritance
{
class Employee
{
static double totalsalary,laboursalary1,managersalary1,vpsalary1;
Labour l = new Labour("ABC", 9, 100); <---------------------------Exception thrown here as stackoverflowexception
Manager m = new Manager("PQR", 10000, 5000, 1000);
VicePresident vp = new VicePresident("XYZ", 20000, 10000, 5000);
SalesManager sm = new SalesManager("KLM", 8000, 2000, 500, 50);
public Employee()
{
laboursalary1 = l.getTotalSalary();
managersalary1 = m.getTotalSalary();
vpsalary1 = vp.getTotalSalary();
}
public static double calculateTotalSalary(Labour l, Manager m, VicePresident vp, SalesManager sm)
{
totalsalary = laboursalary1 + managersalary1 + vpsalary1;
Console.WriteLine(totalsalary);
return totalsalary;
}

Labour.cs
namespace Inheritance
{
class Labour:Employee
{
private string p1;
private double p2;
private double p3;

public Labour(string p1, double p2, double p3)
{
Console.WriteLine("Labour");
// TODO: Complete member initialization
this.p1 = p1;
this.p2 = p2;
this.p3 = p3;
}
public double getTotalSalary()
{
double laboursalary= p2*p3;
Console.WriteLine(laboursalary);
return laboursalary;
}
}
}
}
}
The exception is thrown at  above specified code. How I can solve this problem, this Exception?
Manager.cs
namespace Inheritance
{
  class Manager:Employee
  {
  private string p1;
  private double p2;
  private double p3;
  private double p4;

  public Manager(string p1, double p2, double p3, double p4)
  {
  Console.WriteLine("Manager");
  // TODO: Complete member initialization
  this.p1 = p1;
  this.p2 = p2;
  this.p3 = p3;
  this.p4 = p4;
  getTotalSalary();
  }

  public double getTotalSalary()
  {
  double managersalary = p2 + 30% p3 + p4;
  Console.WriteLine(managersalary);
  return managersalary;
  }
  }
}
SalesManager.cs
namespace Inheritance
{
  class SalesManager:Manager
  {
  private string p1;
  private double p2;
  private double p3;
  private double p4;
  private double p5;

  public SalesManager(string p1, double p2, double p3, double p4, double p5):base("PQR", 10000, 5000, 1000)
  {
  Console.WriteLine("salesmanager");
  // TODO: Complete member initialization
  this.p1 = p1;
  this.p2 = p2;
  this.p3 = p3;
  this.p4 = p4;
  this.p5 = p5;
  getTotalSalary();
  }
 
  public new double getTotalSalary()
    {
      double smsalary= p2 + 50% p3 + p4;
  Console.WriteLine(smsalary);
  return smsalary;
    }
  }
}
VicePresident.cs
namespace Inheritance
{
  class VicePresident:Employee
  {
  private string p1;
  private double p2;
  private double p3;
  private double p4;

  public VicePresident(string p1, double p2, double p3, double p4)
  {
  Console.WriteLine("VP");
  // TODO: Complete member initialization
  this.p1 = p1;
  this.p2 = p2;
  this.p3 = p3;
  this.p4 = p4;
  getTotalSalary();
  }
 
  public double getTotalSalary()
    {
  double vpsalary= p2 + 50 % p3 + p4;

  Console.WriteLine(vpsalary);
  return vpsalary;

  }
  }
}