Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Window form Application

Posted on 2012-04-05
1
Medium Priority
?
221 Views
Last Modified: 2012-04-24
Am building windows form application using VS2010.
I created a class that generate patientNo.
Now am testing to see if the class is functioning as expected , using message box to dispaly
patientNo.
when i run the application and set Gender from a combobox and click on the generate
Button, i got an error: null reference exception point to the variable reading selectedvalue from the combobox. pls help
here is the code:
Question.txt
0
Comment
Question by:Atouray
1 Comment
 
LVL 86

Accepted Solution

by:
Mike Tomlinson earned 1000 total points
ID: 37812139
You could check for null like this:

    if (comboBox2.SelectedValue != null)
    {
        // ... rest of your code ...
    }
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

As with any other System Center product, the installation for the Authoring Tool can be quite a pain sometimes. This article serves to help you avoid making these mistakes and hopefully save you a ton of time on troubleshooting :)  Step 1: Make sur…
Lync meeting or Lync conferencing is what many organizations would like to deploy to allow them save money. But companies are now giving up for various reasons, one of which is that they cannot join external meetings (non-federated company meetings)…
The viewer will learn how to use the =DISCRINV command to create a discrete random variable, use this command to model a set of probabilities and outcomes in a Monte Carlo simulation, and learn how to find the standard deviation of a set of probabil…
The viewer will learn how to create two correlated normally distributed random variables in Excel, use a normal distribution to simulate the return on different levels of investment in each of the two funds over a period of ten years, and, create a …

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question