avoid inserting duplicate value for every block

To achieve this in a .NET application, you can utilize data structures like dictionaries or hashsets to store unique values for each block. Additionally, you can implement a mechanism to enforce read-only access to the compounding wall value across blocks.

using System;
using System.Collections.Generic;

public class Application
{
    private Dictionary blockPrices = new Dictionary();
    private decimal compoundingWallPrice;

    public void SetBlockPrice(string blockName, decimal price)
    {
        if (!blockPrices.ContainsKey(blockName))
        {
            blockPrices[blockName] = price;
        }
    }

    public decimal GetBlockPrice(string blockName)
    {
        return blockPrices.ContainsKey(blockName) ? blockPrices[blockName] : 0;
    }

    public decimal CompoundingWallPrice
    {
        get { return compoundingWallPrice; }
        private set { compoundingWallPrice = value; }
    }
}