将datatable列中的值四舍五入为最接近的50

using System;
using System.Data;

class Program
{
    static void Main()
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("Value", typeof(double));
        dt.Rows.Add(43);
        dt.Rows.Add(57);
        dt.Rows.Add(72);

        foreach (DataRow row in dt.Rows)
        {
            double value = Convert.ToDouble(row["Value"]);
            double roundedValue = Math.Round(value / 50) * 50;
            row["Value"] = roundedValue;
        }

        foreach (DataRow row in dt.Rows)
        {
            Console.WriteLine(row["Value"]);
        }
    }
}