Array: "Index was outside the bounds of the array"

Question

I get the following error on my web application: "Index was outside the bounds of the array." The strange thing is, that the problem only comes on my webserver (Windows Server 2008 R2, .Net 4.0, Windows 7 Enterprise 64 Bit). When I debug the site in Visual Studio, it all works perfect The Code looks like this: I define an array and give it to the class "CheckUserRights" ``` string NTLogin = Page.User.Identity.Name.ToString().Split(new char[] { '\' })[1].ToUpper(); string[] allowedRoles = new string[2] { "Administrator", "Superuser" }; CheckUserRights Check = new CheckUserRights(NTLogin, allowedRoles); ``` The class looks like this: ``` //Lokale Variablen definieren string strUserName; string strRolename; string[] AllowedRoles; bool boolAuthorized; //Im Konstruktor definierte Werte übergeben. public CheckUserRights(string Username, string[] Roles) { this.strUserName = Username; this.AllowedRoles = Roles; getRoleForUser(); checkRights(); } ... ... ``` I have searched for a solution aft…

Accepted Answer

There are many problems in that code, but, sticking to the problem on the question title I think that this line looks suspicious:

```
string NTLogin = Page.User.Identity.Name.ToString().Split(new char[] { '\' })[1].ToUpper();  
```

what happen if the Page.User.Identity.Name doesn't contain a DOMAIN\USERNAME?

Could be rewritten as

```
string[] nameparts = Page.User.Identity.Name.ToString().Split(new char[] { '\' });
string NTLogin = (nameparts.Length == 2 ? nameparts[1] : nameparts[0]).ToUpper();
if(NTLogin.Length == 0)
    return;            
```

Why this property could be the error? Look at this article

Array: "Index was outside the bounds of the array"

Solution

Problem