NullReference exception was unhandled by user code C#

Question

I am still learning to program in C# and working on a project in office

public static void SetIdentity(string subId)
{
    if (Proxy.ClientCredentials != null)
    {
        Proxy.ClientCredentials.UserName.UserName = subId;// 
        Proxy.ClientCredentials.UserName.Password = subId;
    }

    ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(customXertificateation);
}

This is where I get this exception: NullReferenceException was unhandled by user code

Can someone please take a look and suggest me what could be be wrong here?

And what did your debugger tell you? I can never understand why the majority of `NullReference` type exceptions are ever posted to SO when it is *faster* to run your debugger which will tell you *what* is null. — Moo-Juice, Nov 05 '13 at 16:33
A `NullReferenceException` cries for the debugger. _"I am still learning to program"_ Then now is the best time to [learn how to use it](http://msdn.microsoft.com/en-us/library/sc65sadd(v=vs.90).aspx). — Tim Schmelter, Nov 05 '13 at 16:34
http://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it ....21k views and still, one of the most common issues posted. — Arran, Nov 05 '13 at 16:37

score 0 · Accepted Answer · answered Nov 05 '13 at 16:37

0

You may want to check whether UserName is also not null

public static void SetIdentity(string subId)
{
    if (null != Proxy.ClientCredentials && null != Proxy.ClientCredentials.Username)
    {
        Proxy.ClientCredentials.UserName.UserName = subId;// 
        Proxy.ClientCredentials.UserName.Password = subId;
    }

    ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(customXertificateation);
}

answered Nov 05 '13 at 16:37

DobleA

334
1
3
13

[Check.](http://stackoverflow.com/questions/19793957/nullreference-exception-was-unhandled-by-user-code-c-sharp#comment29424435_19793957) – Robert Harvey Nov 05 '13 at 16:37
It's funny because almost anything in this entire code block could be null...we don't even know what Proxy is. – Bensonius Nov 05 '13 at 16:38
1

Yoda conditions are so passé. – Robert Harvey Nov 05 '13 at 16:40

score 0 · Answer 2 · answered Nov 05 '13 at 16:38

0

Check to make sure that the UserName member of the Proxy.ClientCredentials object is not null as well. Something like this:

public static void SetIdentity(string subId)
{
    if (Proxy.ClientCredentials != null && Proxy.ClientCredentials.UserName != null)
    {
        Proxy.ClientCredentials.UserName.UserName = subId;// 
        Proxy.ClientCredentials.UserName.Password = subId;
    }

    ServicePointManager.ServerCertificateValidationCallback += new System.Net.Security.RemoteCertificateValidationCallback(customXertificateation);
}

answered Nov 05 '13 at 16:38

joe_coolish

7,201
13
64
111

ok trying,, I just started with C# last month and this is my forst program ,, just bear with me guys ... – vishal Nov 05 '13 at 17:04
got it,,, debug step by step and found environment I was hitting wasnt configured correctly to accept username and password... – vishal Nov 05 '13 at 17:15

NullReference exception was unhandled by user code C#

2 Answers2