显示日期不在数据库中，仅显示一周中的特定日期

Question

I have a sql database filled with specific dates for weekly training. We only have weekly training on Tuesdays and Wednesdays. It currently outputs like this:

Training Schedule

Mar 4 - Training Title
Mar 5 - Training Title
Mar 12 - Training Title
Mar 19 - Training Title

Well now I am being asked to show dates that aren't in the database as well but only Tuesday's and Wednesdays. So basically it has to look like this now.

Training Schedule

Mar 4 - Training Title
Mar 5 - Training Title
Mar 12 - Training Title
Mar 13 - No Training
Mar 19 - Training Title
Mar 20 - No Training

What is the best way to do this without going in and adding all the 'No Training' dates to the database (because that would take forever). Right now I'm simply just outputting the database results using the following code:

var now = DateTime.Now;
var tableSql = "select * from Training where Date >= " + "'" + now + "'" + " order by Date";
pcm.CommandText = tableSql;
prs = pcm.ExecuteReader();
var rowcount = 0;
while (prs.Read())
   {
     rowcount++;
          %>
 <%=Convert.ToDateTime(prs["Date"].ToString()).ToString("MMM d").ToUpper()%> - <%=prs["Title"].ToString().ToUpper() %> <% } %>
        <%
            prs.Close();
            pcn.Close();
        %>

Answer 1

Loop through the dataset returned by the SQL query and add the results to a collection ( List<string> ). Then take your known date range and loop through those dates and if the day of week is Tuesday or Thursday, check your collection to see if there is a value for that date. If so, display that string, if not, display the "No Training" message.