C#

Action<int> DoSomething = (i) => dt.Rows[i][3];   // Create an action with 'i' as an argument and dt as an enclosing scope variable
for (int i = 0; i < dt.Rows.Count; i++
   DoSomething(i);  // Call the action passing the current value of i as a parameter

dt.Rows[i][7].ToString()

Quote:

I'm trying hard to learn and have had some successes yet. I'm working on a reporting project. Sometimes I need help to solve my problems during the developing process. I use YouTube, StackOverFlow, Codeproject, Google, etc. and finally find my answer and learn the points. Microsoft documentation is great for learning but there are moments you need to get help from others about how and with what tools you can solve your problem. And this website has helped me a lot. Now, At the same time, I'm learning ASP.NET using YouTube tutorials. I can achieve my goals. One day, I will be a good programmer. I promise.

class ActivityTimeSum
    {
        public string settings { get; set; }
        public string dataTableName { get; set; }
        public DataTable selectDT { get; set; }
        public CheckEdit checkBox1 { get; set; }
        public CheckEdit checkBox2 { get; set; }
        public CheckEdit checkBox3 { get; set; }
        public CheckEdit checkBox4 { get; set; }

        Dictionary<string, int> myDic = new Dictionary<string, int>();
        List<string> keys = new List<string>();
        List<int> values = new List<int>();
        List<CheckEdit> checkBoxes = new List<CheckEdit>();
        List<string> selectedCheckBox = new List<string>();

        public Dictionary<string, int> CalculateTime()
        {
            checkBoxes.Add(checkBox1);
            checkBoxes.Add(checkBox2);
            checkBoxes.Add(checkBox3);
            checkBoxes.Add(checkBox4);

            foreach (var c in checkBoxes)
            {
                if (c.Checked)
                {
                    selectedCheckBox.Add(c.Tag.ToString());
                }
            }
            for (int i = 0; i < selectDT.Rows.Count; i++)
            {
                switch (selectedCheckBox.Count)
                {
                    case 1:
                        keys.Add(selectDT.Rows[i][Int32.Parse(selectedCheckBox[0])].ToString());
                        break;
                    case 2:
                        keys.Add(string.Join(", ", selectDT.Rows[i][Int32.Parse(selectedCheckBox[0])].ToString(), 
                            selectDT.Rows[i][Int32.Parse(selectedCheckBox[1])].ToString()));
                        break;
                    case 3:
                        keys.Add(string.Join(", ", selectDT.Rows[i][Int32.Parse(selectedCheckBox[0])].ToString(),
                            selectDT.Rows[i][Int32.Parse(selectedCheckBox[1])].ToString(), selectDT.Rows[i][Int32.Parse(selectedCheckBox[2])].ToString()));
                        break;
                    case 4:
                        keys.Add(string.Join(", ", selectDT.Rows[i][Int32.Parse(selectedCheckBox[0])].ToString(),
                            selectDT.Rows[i][Int32.Parse(selectedCheckBox[1])].ToString(), selectDT.Rows[i][Int32.Parse(selectedCheckBox[2])].ToString(),
                            selectDT.Rows[i][Int32.Parse(selectedCheckBox[3])].ToString()));
                        break;
                }
                values.Add(Int32.Parse(selectDT.Rows[i][11].ToString()));
            }

            for (int i = 0; i < selectDT.Rows.Count; i++)
            {
                if (myDic.ContainsKey(keys[i]))
                {
                    myDic[keys[i]] += values[i];
                }
                else
                {
                    myDic[keys[i]] = values [i];
                }
            }
            return myDic;

List<string> words = source.Split(',').Select(s => s.Trim()).ToList();

string.Split(", ", StringSplitOptions.None);

var jobStartDates = dc.JobStartDates.AsNoTracking().Include(jsd => jsd.Revisions).Where(jsd => jsd.JobId == jobId).ToList();
var results = jobStartDates.Select(jsd => new JobStartDateEntity
{
    Id = jsd.Id,
    ...
    StartDateRevisions = jsd.Revisions.Select(sdr => new JobStartDateRevisionEntry
    {
        Id = sdr.Id,
        ...
    }).OrderByDescending(sdr => sdr.Revision).ToList(),
});

var results = (from jsd in dc.JobStartDates
               where jsd.JobId == jobId
               select new JobStartDateEntity
               {
                   ...
               }).ToList();

var jobStartDateIds = results.Select(jsd => jsd.Id).ToList();

var revisions = dc.JobStartDateRevisions
    .Where(sdr => jobStartDateIds.Contains(sdr.Id))
    .Select(sdr => new JobStartDateRevisionEntity { ... })
    .ToList();

forech (var result in results)
{
    result.StartDateRevisions = revisions
        .Where(sdr => sdr.Id == result.Id)
        .OrderByDescending(sdr => sdr.Revision)
        .ToList();
}

public string dateText { get; set; }
       DateTime date;
       string[] formats = {"yyyy/MM/dd", "yyyy/M/d", "yy/MM/dd", "yy/M/d" };
       DateTime result;

       public bool CheckFormat()
       {
           if (!DateTime.TryParseExact(dateText, formats, CultureInfo.InvariantCulture,DateTimeStyles.None, out result))
           {
               return false;
           }
           else
           {
               return true;
           }
       }