Question

In one .aspx webpage I have 2 contacts details in two different <div> like below

<div id="primaryContact"> 
    Name - betty quay 
    Cell - 9867452389
    designation - Build 
</div>

<div id="secondryContact"> 
    Name - francesco maitire 
    Cell - 9867452389
    designation - Build 
</div>

Here I want to show each div on alternate day of a week.
How can I do so, using ASP.NET or Javascript?

Answer 1

You can do it in C# like this:

    protected void Page_Load(object sender, EventArgs e)
    {
        ShowContactAlternate();
    }

    private void ShowContactAlternate()
    {
        if ((int)DateTime.Now.DayOfWeek % 2 == 0)
            primaryContact.Visible = true;
        else
            secondaryContact.Visible = true;
    }

Also make sure that you change your markup to something like this and add runat="server and Visible="False" attributes to divs”:

<div id="primaryContact" runat="server" Visible="False"> Name - betty quay Cell - 9867452389 designation - Build </div>
<div id="secondryContact" runat="server" Visible="False"> Name - francesco maitire Cell - 9867452389 designation - Build </div>

EDIT:

If you want to alternate every week you can do it like this probably:

Create this helper function:

private int GetWeekOfYear(DateTime date)
{
    return CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(date, 
            CalendarWeekRule.FirstFourDayWeek,
            DayOfWeek.Monday);
}

And you can use it in your if statement inside ShowContactAlternate line this:

if (GetWeekOfYear(DateTime.Now) % 2 == 0)

As every year has 52 weeks you have to be sure that you don’t run in to trouble every new year. It shouldn’t be a problem to solve.