NullReferenceException unhandled by usercode

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C#

.NET

Hey all,

I´m getting an Exception in a method, but i don´t know why...
it is only thrown when the input of the TextBox could not be found, but I think I´m checking against it. Perhaps wrong thinking?

public String getUser()
        {
            String user = User.Identity.Name.Split(new Char[] { '\\' })[1];
            if (TextBox_Admin.Visible && TextBox_Admin.Text.Length > 0)
            {
                DirectorySearcher searcher = new DirectorySearcher("(&(name=" + TextBox_Admin.Text.ToString() + ")(objectClass=user))");
                searcher.SearchRoot = entiry;
                searcher.PropertiesToLoad.Add("cn");
                SearchResult res = searcher.FindOne();
                
                if (res.Properties.Contains("cn") && res.Properties.Equals(TextBox_Admin.Text))//at this point the Exception is thrown
                    user = TextBox_Admin.Text.ToString();
                else
                {
                    Label_Admin.Text = "Unknown User";
                    user = null;
                }
            }  
            return user;
        }

NullReferenceException:
Object reference not set to an instance of an object.
Can someone help?



Ok, found it ;)