如何在asp.net中仅选择当前日期和即将到来的日期

Question

I am using calendar control in asp.net. When the user select the date it will be displayed in the textbox. This is the code that I used for that:

protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        TextBox1.Text = Calendar1.SelectedDate.ToString("dd/MM/yy");

    }

But I want to make only the current and upcoming dates to be selectable. When the user select the past date, I want to display a error message. How can I do this?

Answer 1

You need to handle DayRender event.

ASPX:

<asp:Calendar ID="Calendar1" runat="server" ondayrender="Calendar1_DayRender"> </asp:Calendar>

CodeBehind : disable's past days

  protected void Calendar1_DayRender(object sender, DayRenderEventArgs e)
  {
        if (e.Day.Date.CompareTo(DateTime.Today) < 0)
        {
            e.Day.IsSelectable = false;
        }
  }