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using System;
 
public class Test
{
	public class A
	{
		public string P1{get;set;}
		public string P2{get;set;}
		public string P3{get;set;}
		public string P4{get;set;}
		public string P5{get;set;}
		public string P6{get;set;}
	}
 
	public class B : A
	{
		public string P7{get;set;}
	}
 
	public static void Main()
	{
		A varA = new A();
		//Sets all the A's properties;
 
		//Now,
		B varB = //B instance with the properties values of varA without doing :
		//varB.P1 = varA.P1;
		//...
	}
}

prog.cs(8,17): error CS0102: The type `Test.A' already contains a definition for `P1'
prog.cs(7,17): (Location of the symbol related to previous error)
prog.cs(9,17): error CS0102: The type `Test.A' already contains a definition for `P1'
prog.cs(7,17): (Location of the symbol related to previous error)
prog.cs(10,17): error CS0102: The type `Test.A' already contains a definition for `P1'
prog.cs(7,17): (Location of the symbol related to previous error)
prog.cs(11,17): error CS0102: The type `Test.A' already contains a definition for `P1'
prog.cs(7,17): (Location of the symbol related to previous error)
prog.cs(12,17): error CS0102: The type `Test.A' already contains a definition for `P1'
prog.cs(7,17): (Location of the symbol related to previous error)
Compilation failed: 5 error(s), 0 warnings

Standard output is empty