Hi,

I'm developing a Windows Service in VB.Net and set the Account property of the ServiceProcessInstaller as "User", which is my security requirement. So whenever I tried to install the service using INSTALLUTIL.exe, it is prompting to enter user id and password information. To avoid that I have written below code:



This is working fine. But now my requirement is to get the user name and password from the config file. So I have updated the above code like shown below:



Compiled the code and tried to install the service using INSTALLUTIL but getting below errors:

Read the line numbers 16, 17, 27 & 28 for the error details. And also I'm not getting any error information in the log files (the code is there in the catch block).

Could some one assist me to resolve this issue.

Thanks,
Srikanth

Hi Kakkunuri,

I performed a test basedon your description and reproduce the problem on my side.

The NullReferenceException actually occurs from the line of code:

Upload_ServiceProcessInstaller.Username=System.Configuration.ConfigurationManager.AppSettings("ServiceUser").ToString()

This is because the "System.Configuration.ConfigurationManager.AppSettings("ServiceUser")" returns Nothing. Calling any method on Nothing raises the NullReferenceException.

In fact, only WinForm executable application will read from their configuration files. Configuration files doesn't make sense to assemblies other than WinForm executable application.

You have to either input the username and password in the prompt while installing the service or hard code the username and password in the override Install method.

Hope this helps.

Sincerely,
Linda Liu

Hi Kakkunuri,

I performed a test basedon your description and reproduce the problem on my side.

The NullReferenceException actually occurs from the line of code:

Upload_ServiceProcessInstaller.Username=System.Configuration.ConfigurationManager.AppSettings("ServiceUser").ToString()

This is because the "System.Configuration.ConfigurationManager.AppSettings("ServiceUser")" returns Nothing. Calling any method on Nothing raises the NullReferenceException.

In fact, only WinForm executable application will read from their configuration files. Configuration files doesn't make sense to assemblies other than WinForm executable application.

You have to either input the username and password in the prompt while installing the service or hard code the username and password in the override Install method.

Hope this helps.

Sincerely,
Linda Liu

Hi Sikrath,

please tell us, whats in 'upload'. Thanks

Gerhard