Time Difference

Ishan Bhutani

9y951.NET

I am creating a quiz application and I want to calculate the time elapsed between the page load and the button click.

Here is the code I am trying but unable to calculate.The timeSpan show 0(Zero) as the difference even after hours.

Code Start

protected void Page_Load(object sender, EventArgs e)

{

if (Page.IsPostBack == false)

{

dtAlgebraLoad = DateTime.Now;

lblTimeLoad.Text = "Initial time: " + dtAlgebraLoad.ToString();

}

protected void btnAlgebraSubmit_Click(object sender, EventArgs e)

{

dtAlgebraNext = DateTime.Now;

lblTimeSubmit.Text = dtAlgebraNext.ToString();

}

protected void btnAlgebraNext_Click(object sender, EventArgs e)

{

TimeSpan timeSpan = dtAlgebraNext.Subtract(dtAlgebraLoad);

lblTimeDifference.Text = timeSpan.ToString();

}

Code End

Can some help me with the code.

7 Replies

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Bikesh Srivastava9y ago
Change code something like given.
DateTime StartTime = DateTime.Parse("08:00 AM");

DateTime EndTime  = DateTime.Parse("04:00 PM"); // It converts this to 1600.

TimeSpan ts = EndTime - StartTime;
0
Rajeev Punhani9y ago
Hi Ishan ,

From your code it appears that you have declared these 2 variables(dtAlgebraLoad,dtAlgebraNext) above page_load method. You can make your code working by just adding static keyword before them.Since on page_load and button_click you are assigning the values to the variable and these are again set to default values when you click next button,so you are getting 0.
Another approach is to set these time in a labels and then use these labels text to find time difference.
1)First way
static DateTime dtAlgebraLoad, dtAlgebraNext;
2)Second way :Remove "Initial time: " + from lblTimeLoad.Text and in btnAlgebraNext_Click calculate timespan like this.
TimeSpan timeSpan =Convert.ToDateTime(lblTimeSubmit.Text) - Convert.ToDateTime(lblTimeLoad.Text);
0
Nilesh Shah9y ago
Why don't you put the test start time in session and allow it to be updated only once at this time and nowhere afterwards.

Then every where you can show time based on this session value.
0
Ramesh Palanivel9y ago
HI Ishan,

Is your dtAlgebraLoad , dtAlgebraNext both variables are declared as DataTIme fields?
0
Rafnas T P9y ago
Please check you are updating dtAlgebraLoad field any where except page load?
0
Abhinav Abhishek9y ago
DateTime dt1 = DateTime.Parse(dtAlgebraLoad .Text);DateTime dt2 = DateTime.Parse(dtAlgebraNext.Text);
TimeSpan span = dt2 - dt1;
0
Nitin Sontakke9y ago
Try debugging your code...I am assuming that all your controls are server-side.

Why two different events, is not clear, Submit and Next.

You may have to assign value to dtAlgebraNext in btnAlgebraSubmit_Click as well.
0

Time Difference

DateTime dt1 = DateTime.Parse(dtAlgebraLoad .Text); DateTime dt2 = DateTime.Parse(dtAlgebraNext.Text); TimeSpan span = dt2 - dt1;

`DateTime dt1 = DateTime.Parse(dtAlgebraLoad .Text);DateTime` dt2 = DateTime.Parse(dtAlgebraNext.Text);
`TimeSpan span = dt2 - dt1;`