C# - Getting a line number and the string

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C#

this is my code

int i = 0;
   foreach (string item in Properties.Settings.Default.DatesEventNames)
   {
       //add the headings
       if ((i++ % 3) == 0)
       {
           //add label
           Label neweventlabel = new Label();
           neweventlabel.Content = item;
           SP1.Children.Add(neweventlabel);

           DateTime yourDateTime = DateTime.Parse(Properties.Settings.Default.DatesEventNames[i]);
           DateTime yourDateTime2 = DateTime.Parse(Properties.Settings.Default.DatesEventNames[i + 2]);

           //add progressbar
           ProgressBar pb = new ProgressBar();
           pb.Maximum = (yourDateTime - yourDateTime2).TotalDays;
           pb.Value = (yourDateTime - DateTime.Now.Date).TotalDays;
           pb.Height = 20;
           SP1.Children.Add(pb);
       }
   }

this is what is looks like in the stringcollection

event1<br />
10/01/2013<br />
13/01/2013<br />
event3<br />
12/01/2013<br />
14/01/2013

what this code dose at the moment is grabs every third string in stringcollection so it looks like this

event1<br />
event2

but i want to out a progressbar inbetween them so it looks like this

event1<br />
|-----progressbar-----|<br />
event2<br />
|-----progressbar-----|

right now im trying to give the values to the progressbars. for example I want these vales from event1

Start Date - 10/01/2013<br />
End Date - 13/01/2013<br />
Todays Date - ??/??/????

so for the progress bar it will have

The maximum = (start date to end date)<br />
The Value = (todays date to the end date)

Im having trubble getting the values for the convention in the strings in the dates

So lets say on this line of code

int i = 0;
          foreach (string item in Properties.Settings.Default.DatesEventNames)
          {
              //add the headings
              if ((i++ % 3) == 0)
              {
}

}

lets say it lands on event2, I want it to get that strings line number lets just say its line 3, then I want it to go down 1 line number, which will make it line 4, and in line 4 would be the date. and this will give me the values. I hope this explains it, please re-read this question in-case you miss something.

Summery
Problem: Finding the values for the datetime in the string collection
Question: Can you help me find the answer to this problem?