btnCheckClear - Need to Add 3 Day to current Transaction Date : I am working in C#.

I have a button that needs to add 3 days to the current transaction date already in ArrayList.

How to accomplish this?

The code is as follows:

private void btnCheckCleared_Click(object sender, EventArgs e)
        {
            foreach (Transaction item in tranArray)
            {
                if (What goes here?)
                {
                    DateTime.Today.AddDays(3).ToLongDateString();
                }
            }
        }

If you need the whole project, please let me know