Time Difference

Question

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.

Bikesh Srivastava · Answer

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;

Rajeev Punhani · Answer

Hi Ishan  From your code it appears that you have declared these 2 variables(dtAlgebraLoaddtAlgebraNext) 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 buttonso 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);

Nilesh Shah · Answer

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.

Ramesh Palanivel · Answer

HI Ishan Is your dtAlgebraLoad  dtAlgebraNext both variables are declared as DataTIme fields?

Rafnas T P · Answer

Please check you are updating dtAlgebraLoad field any where except page load?

Abhinav Abhishek · Answer

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

Nitin Sontakke · Answer

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 .