Customising the Calendar Control in ASP.NET

This Article will show you how to customise the Calendar Control in ASP.NET.

The Day_Render Event of the Calendar Control is used for many purposes like Enabling and Disabling Valid Dates.
Changing Visiblity of Selected Dates etc.

I will be showing some of the Usages of the Day_Render Event.

A) Restrict users to select date less than todays date.
The Following Code Has to be written in the Day_Render event of the Calendar Control.

protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (e.Day.Date >= DateTime.Today.Date)
        {
            e.Cell.Enabled= false; // Changes the Cells Enable Property
            e.Day.IsSelectable = false; // Disables the Cells Click Property
        }
    }

B) Allow users only to select dates greater than todays date

    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (e.Day.Date <= DateTime.Today.Date)
        {
            e.Cell.Enabled= false; // Changes the Cells Enable Property
            e.Day.IsSelectable = false; // Disables the Cells Click Property
        }
    }

C) Change apprearnce of selected dates and add tooltips or Disable the Click on the Selected Date

    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (e.Day.Date == DateTime.Today.AddDays(-3))//Code for Specific Date
        {
            e.Cell.ForeColor = System.Drawing.Color.Red;
            e.Cell.ToolTip = "Holiday "; // ToolTip for the Date
            e.Day.IsSelectable = false;
        }
        if (e.Day.Date == DateTime.Today.AddDays(-7))//Code for Specific Date
        {
            e.Cell.ForeColor = System.Drawing.Color.Red;
            e.Cell.ToolTip = "Holiday "; // ToolTip for the Date
            e.Day.IsSelectable = false;
        }
    }

D) To Mark weekends on the calander control

    protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
    {
        if (e.Day.IsWeekend)
        {
            e.Cell.ForeColor = System.Drawing.Color.Red;
        }
    }

Regards
Hefin Dsouza