C#

public class DeltaCollection<T1, T2, T3> :
       IList, 
       IList<Tuple<T1, T2, T3>>, 
       IList<Tuple<T1?, T2?, T3?>>
       where T1 : struct, T2 : struct, T3 : struct

Gideon Engelberth wrote:

Like Eddy said, for your situation, you will have to loop somewhere.

public class keyedNullableIntTable : Dictionary<int, List<int?>>
{
    private int?[] referenceValues = new int?[3];

    public void Add(int theKey, List<int?> theValues)
    {
        for (int i = 0; i < 3; i++)
        {
            if (theValues[i] == null)
            {
                if (referenceValues[i] != null)
                {
                    theValues[i] = referenceValues[i];
                }
            }
            else
            {
                referenceValues[i] = theValues[i];
            }
        }

        base.Add(theKey, theValues);
    }
}

private void button1_Click(object sender, EventArgs e)
{
    keyedNullableIntTable t1 = new keyedNullableIntTable();

    t1.Add(1, new List<int?> { 100,null,300 });
    t1.Add(2, new List<int?> { null, null, 300 });
    t1.Add(3, new List<int?> { 222, 333, 444 });
    t1.Add(4, new List<int?> { 111, null, null });
    t1.Add(5, new List<int?> { null, null, null });

    foreach (var theEntry in t1)
    {
        Console.Write("key = " + theEntry.Key + "\tlist = ");
        foreach (var listValue in theEntry.Value)
        {
            Console.Write(listValue + " : ");
        }
        Console.WriteLine();
    }
}

1. Right click the installer project in Solution View, select View --> File System
2. Right Click "File System on Target Machine" --> Add Special Folder --> User's Startup Folder
3. Select the Application Folder, Right click the Primary output & Create Shortcut.
4. Move the shortcut to the Startup folder created in Step 2.

public boolean IsFolderValid() { ... return false;}

public boolean FolderValid {
    get { ... return false; }
}