Since this concerns a web application, you must store the startTime
in a way where it can be restored on a later post back.
Here's a quick sample that should work using ViewState
:
private const string StartTimeViewstateKey = "StartTimeViewstateKey";
protected void btnStartTime_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
ViewState[StartTimeViewstateKey] = startTime.ToString(CultureInfo.InvariantCulture);
}
protected void btnEndTime_Click(object sender, EventArgs e)
{
var startTime = DateTime.Parse((string)ViewState[StartTimeViewstateKey], CultureInfo.InvariantCulture);
var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes;
lblEndTime.Text = ("The Work duration is " + workDuration);
}
Alternatively you could use session state:
private const string StartTimeSessionKey= "StartTimeSessionKey";
protected void btnStartTime_Click(object sender, EventArgs e)
{
var startTime = DateTime.Now;
Session[StartTimeSessionKey] = startTime;
}
protected void btnEndTime_Click(object sender, EventArgs e)
{
var startTime = (DateTime)Session[StartTimeSessionKey];
var workDuration = DateTime.Now.Subtract(startTime).TotalMinutes;
lblEndTime.Text = ("The Work duration is " + workDuration);
}