how can I remind events on time in C#?

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I am trying but no use, Can anyone help me solve this?
I have given a facility to user to select the reminder type (such as daily, weekly[user will be asked to select a day], on a special day)
and when the user add an event after filling such fields (event name, event description, reminder type, date and time) and the app should remind him the events on specific time.
Please help me to do with this task?

My code - A method that will be called into the main form

C#

public void Reminders()
        {
            SqlCeConnection conn = new SqlCeConnection("Data Source=E:\\Project Final_Year\\Project Final\\MyProject\\ERU Implementation\\VirtualPetedit\\VirtualPet\\MyDB.sdf");
            string query = "SELECT time FROM Events";
            SqlCeDataReader r;
            DateTime thisDay = DateTime.Today;
            

            
            try
            {
                conn.Open();
                SqlCeCommand command = new SqlCeCommand(query, conn);
                r  = command.ExecuteReader();
                //if (r.HasRows)
                       // {
                DateTime tag = r.GetDateTime(0);
                            while (r.Read())
                            {
                                int result = DateTime.Compare(thisDay, tag);
                                if (result == 0)
                                    MessageBox.Show("You have a reminder at this moment");

                                /*
                                DateTime tag = r.GetDateTime(0);
                                if (r.GetDateTime(0)  == thisDay )
                                {
                                    
                                    VirtualPet.Popup popup = new VirtualPet.Popup();
                                    popup.Reminder();
                                }*/
                            }
                       // }
                       /* else
                        {
                            MessageBox.Show("No Reminder times currently");                          
                        }*/
                conn.Close(); 
            }
            catch (Exception ex)
            { 
              //  MessageBox.Show(ex.Message.ToString());
            }
        }

Posted 24-May-15 23:59pm

Abdul Rahman BCS

Updated 25-May-15 0:16am

Frankie-C

v3

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OriginalGriff · Answer 1 · 2015-05-25T00:19:00

The problem with that approach is that the reminder time has to be accurate: to the microsecond or the comparison will fail.
Instead of looking for equality, add a column to your DB which indicates that a reminder has been issued and acknowledged. Then change your SQL SELECT to only return "unused" reminders.
And move the usage of the SqlReader inside the loop!
Then, change your comparison code to:

C#

try
    {
    conn.Open();
    using (SqlCeCommand command = new SqlCeCommand(query, conn))
        {
        r = command.ExecuteReader();
        DateTime now = DateTime.Now;
        while (r.Read())
            {
            DateTime tag = r.GetDateTime(0);
            if (tag <= now)
                }
                MessageBox.Show("You have a reminder at this moment");
                }
            }
        }
    conn.Close(); 
    }
catch (Exception ex)
    { 
    MessageBox.Show(ex.Message.ToString());
    }