Error in constructor

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C#

I get the error

"Type 'ConsoleApplication1.TestClass' already defines a member called 'Test Class' with the same parameter type"

out of this Chaining constructor

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class TestClass
    {
        private string MyName;
        private string Conn;
        private int MyNumber;


        public TestClass() { }

        public TestClass(string myName) : this(myName, "", 0) { }

        public TestClass(string connectionString) : this("", connectionString, 0) { }

        public TestClass(int myNumber) : this("", "", myNumber) { }

        public TestClass(string myName, string connectionString, int myNumber)
        {
           MyName = myName;
           Conn = connectionString;
           MyNumber = myNumber;
        }


    }
}

The messagge is clear but how to make this properly. Any help would be very much appreciated.
Almir