MonthCalendar Has a Problem When Displaying

Introduction

I encountered this problem when using System.Windows.Forms.MonthCalendar in my app. When the user changes and selects another month or year on MonthCalendar, this component displays incorrectly (some dates are missing or are in bold). I think it's a problem with the OnPaint() method of this component. It's really a Microsoft problem.

I asked my friends and searched on Google. Many people had faced the same problem, but had not found a solution yet.

Using the Code

I tested and saw that this problem occurred when calling Application.EnableVisualStyles() in the Program.cs file.

To resolve this problem, I have given two ideals here:

1. You should write one custom control or component which inherits or wraps this MonthCalender of Microsoft and overrides the OnPaint() method. It will help you to have a better component which supports your business (such as select range date on MonthCalender).
2. Add mcalSelectDate.SelectionEnd = mcalSelectDate.SelectionStart into MonthCalendar_DateChanged event.

private void mcalSelectDate_DateChanged(object sender, DateRangeEventArgs e)
{
     mcalSelectDate.SelectionEnd = mcalSelectDate.SelectionStart;
}

Hope my suggestions will help you.

History

• 4^th January, 2008: Initial post