NullReferenceException generated after executing in 'Try' block

Question

I am new to ASP.net C#. I have an application to get inputs from users and save in database. I have followed the N-tier architecture in creating this app upon request. I have created an object in the codebehind and set the input values to them and pass the object to a method in the Business Layer and also called a method in Data Access Layer to the Business Layer. The data is saved to the database within the method of the Data Access Layer. Please help.

Here's my codebehind :

try
{
    OtherCompany om = new OtherCompany();
    NDAStaff ns = new NDAStaff();

    DateTime dt = Convert.ToDateTime(RadDatePicker1.SelectedDate);
    om.Date = dt.ToShortDateString();
    om.ComName = compName.Text;
    om.RegNumber = compReg.Text;
    om.Country = countryIncorp.Text;
    om.RegOfficeAddress = officeAddr.Text;
    om.ComRef = compRef.Text;
    om.CoreBuss = busiCore.Text;
    om.ComService = reqServ.Text;

    int index = servList.Items.Count;
    for (int i = 0; i < index; i++)
    {
        om.ReqServiceDetails[i] = servList.Items[i].Value;
    }

    om.ReprentName = fullName2.Text;
    om.ReprentDesig = desigOther.Text;
    om.Witness1Name = witFullName3.Text;
    om.Witness1Desig = witDesig1.Text;
    om.Witness1Address = witDept1.Text;
    om.Witness2Name = witFullName4.Text;
    om.Witness2Desig = witDesig4.Text;
    om.Witness2Adress = witAddr4.Text;

    ns.Staffname = fullName1.Text;
    ns.Designation = desigSriLan.Text;
    ns.Wit1Name = witFullName1.Text;
    ns.Wit1Designation = witDesig1.Text;
    ns.Wit1Department = witDept1.Text;
    ns.Wit2Name = witFullName2.Text;
    ns.Wit2Designation = witDesig2.Text;
    ns.Wit2Department = witDept2.Text;


    NDAGenProcessor ndap = new NDAGenProcessor();
    OtherCompanyProcessor ocp = new OtherCompanyProcessor(om);
    NDAstaffProcessor nsp = new NDAstaffProcessor();


    int NADid = ocp.createNDAID();
    //ndap.createPDF(om, ns, NADid);
    ocp.getCompanyDetails(NADid);
    nsp.addNDAstaffData(ns, NADid);
}

catch (Exception ex)
{
    throw ex;
}

you don't explain WHERE the error happens and catching and rethrowing exceptions are bad practice. — Ahmed ilyas, Feb 26 '15 at 07:02
What is the *stack trace* and on what line of code the exception is thrown? — Dmitry Bychenko, Feb 26 '15 at 07:03
@ProblemChild: change `throw ex;` to `throw;` in order *not to clear stack trace* and show it (*the stack trace*) to us — Dmitry Bychenko, Feb 26 '15 at 07:06
It gives the same message. The error is shown in the codebehind. — ProblemChild, Feb 26 '15 at 07:15
Try by adding ReqServiceDetails[i] = new ReqServiceDetails(); as first line in the loop — Aayushi Jain, Feb 26 '15 at 07:22

score 0 · Answer 1 · answered Feb 26 '15 at 07:20

0

If you want to know what line of code causes the exception, than go to Debug->Exceptions and check the box Thrown Common Language Runtime Exceptions.

You will get so called First Chance Exception. Then debug your code and the debugger will stop in that very line which causes the exception.

answered Feb 26 '15 at 07:20

EngineerSpock

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The exception throws from the "for" loop. The "for" loop is required as I have to load all the items from a listbox to an object and save the items as a string in the database. – ProblemChild Feb 26 '15 at 08:07

NullReferenceException generated after executing in 'Try' block

1 Answers1