How to write ASP.NET lottery ticket?

First of all, I consider that this symbol is generated randomly, so I need to use the random class. Then you can set up a data table of the competition arrangement, including the time and place of the competition, set a sign value for each competition, which can be ABC, A, B and C, and a table of the participating pairs, including some information of the participating pairs. Write the following program in the click event of the lottery button.

First, take out the ticket values that can be drawn from the competition schedule and judge whether there are any tickets left to be drawn.

If there is a label to draw, save the label in the hash table, declare a random object, let the random object randomly generate a value from the key of the hash table, and access the value of the hash table with the randomly generated key. Finally, don't forget to submit the database. This qvalue is a randomly selected symbol, string qvalue = (string) ht [random].