How to Use the calendar Control for calendar management

A few days ago, the lead gave me a task: to write a calendar management function.
I have never written such a function before and have no idea when receiving tasks.
Finally, I found some information on the Internet, but I didn't find any good information. I only found the information that can be implemented using the calendar control.

Finally, it took me a few days to write the calendar management function. Now I will share it with you and hope you will give me more advice.
1. I want to talk about the dayrender event mainly using the calendar control.
/// <Summary>
/// Read the calendar information and set the calendar
/// Zhou haijun
/// </Summary>
/// <Param name = "sender"> </param>
/// <Param name = "E"> </param>
Protected void calschedule_dayrender (Object sender, dayrendereventargs E)
{
// Custom display content
// Obtain the date that is displayed in the calendar control.
Calendarday d = (dayrendereventargs) e). Day;
Calendarday day = E. Day;
// Obtain the cell that is displayed in the calendar control.
Tablecell c = (dayrendereventargs) e). cell;
// C. width = 230;
// Create a lunar conversion class
// Lunar LR = new lunar ();
If (D. isothermonth)
{
C. Controls. Clear ();
}
Else
{
Datetime fdate = new datetime ();
String subject;
Datetime date = new datetime ();
Date = D. date;
Try
{
C. Controls. Clear ();
// Display the date of the current day and the hyperlink
C. Controls. Add (New literalcontrol ("<a href = 'schedbyday. aspx? Date = "+ D. date. year. tostring () + "-" + D. date. month. tostring () + "-" + D. date. day. tostring () + "'style = 'color: #003080; font-size: 12px; '>" + D. date. day. tostring () + "</a> "));
C. controls. add (New literalcontrol ("& nbsp;" + "& nbsp; "+" & nbsp; "+" & nbsp ;"));

// Display hyperlinks, customize a hyperlink, and set attributes
Hyperlink ahyperlink = new hyperlink ();
Ahyperlink. imageurl = "../images/add_small.gif ";
Ahyperlink. tooltip = "add personal calendar ";
Ahyperlink. navigateurl = "plan_addedit.aspx? Id = add & date = "+ D. date. year. tostring () + "-" + D. date. month. tostring () + "-" + D. date. day. tostring () + "";
//
C. Controls. Add (ahyperlink );

}
Catch (exception exc)
{
Response. Write (EXC. tostring ());
}
// Read the information of the day

Plan_day = new plan_day ();
Datatable dt = plan_dayinfo.plan_getby_dateanduser (date. tostring ("yyyy-mm-dd"), inuser );

// Display all information for the day
Try
{
If (DT! = NULL)
{
For (INT I = 0; I <DT. Rows. Count; I ++)
{
// Obtain the calendar primary key planid
Int planid = int32.parse (Dt. Rows [I] ["plan_id"]. tostring ());
// Get the calendar date
Fdate = datetime. parse (Dt. Rows [I] ["plan_date"]. tostring ());
// Only obtain the hour and minute
String fdate_hour = fdate. Hour. tostring ();
String fdate_minute = fdate. Minute. tostring ();
If (fdate_minute = "0 ")
{
Fdate_minute = "00 ";
}
// Obtain the calendar title
Subject = DT. Rows [I] ["plan_subject"]. tostring ();
// Only take the first four digits of the title
If (subject. length> 4)
{
Subject = subject. substring (0, 4 );
Subject + = "..";
}
Htmlanchor A = new htmlanchor ();
// Detailed information pointing to the calendar
A. href = "plan_addedit.aspx? Id = "+ planid + "";
A. innertext ="☉"+ Subject + "";
A. Attributes. Add ("style", "font-size: 12px ;");
C. Controls. Add (New literalcontrol ("& nbsp;" + "& nbsp ;"));
C. Controls. Add (New literalcontrol ("<br> "));
C. Controls. Add ();

}
E. Cell. attributes ["onmouseout"] = "javascript: This. style. backgroundcolor = '';";
E. Cell. attributes ["onmouseover"] = "javascript: This. style. backgroundcolor = '# e8e8e8 ';";
}
}
Catch
{
Return;
}
}
}

Now Code It is also provided to you: I hope you can download the source code with more comments.