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using System;
using System.Collections.Generic;
 
struct RosterLine {
    public string RosCd;
    public string ActCd;
    public double Hrs;
}
 
public class Test
{
	public static void Main()
	{
		// your code goes here
		var dict = new SortedDictionary<DateTime, RosterLine>();
		dict.Add(DateTime.Today, new RosterLine());
		// Does not work as RosterLine is a value type
		dict[DateTime.Today].ActCd = "SO";
		// Works, but means a lot of copying
		var temp = dict[DateTime.Today];
		temp.ActCd = "SO";
		dict[DateTime.Today] = temp;
	}
}

prog.cs(18,21): error CS1612: Cannot modify a value type return value of `System.Collections.Generic.SortedDictionary<System.DateTime,RosterLine>.this[System.DateTime]'. Consider storing the value in a temporary variable
prog.cs(4,8): (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Standard output is empty