Why doesn't this simple code work?

Here is a snippet of code. I didn't post the rest of it because it all works. The only part that doesn't is my when I check to see if there is a value in a datetime field called "Problem" of the returned records and if there is, set it's background color to red. There are CSS classes called "red" and "blue" in my stylesheet. My if statement test just isn't doing what it should for some reason. One of returned records has a datetime value in it's Problem field, and the second doesn't. But they both come out either red or blue, when the first should be blue and the second red.
SqlConnection myConnection = new SqlConnection("server=localhost;" +
                                           "Trusted_Connection=yes;" +
                                           "database=mydb; " +
                                           "connection timeout=30");
                SqlDataReader myReader = null;
                SqlCommand myCommand = new SqlCommand("Select ID, PhoneNumber, Address, DollarAmt, Problem FROM Orders", myConnection);
                myReader = myCommand.ExecuteReader();
 myReader = myCommand.ExecuteReader();
                while (myReader.Read())
                    String problem = myReader["Problem"].ToString();
                    String ID = myReader["ID"].ToString();
                    String bg = "";
                    if(problem != null || problem != ""){
                        bg = "red";    
                    else { bg = "blue"; }
                    Response.Write("<div id='section" + ID + "'>");
                    Response.Write("<ul id='item" + ID + "' class='" + bg + "' onclick='showOptions(\"buttons" + ID + "\");'>");

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käµfm³d 👽Commented:
What is the database definition of the Problem column?
Lokesh B RDeveloperCommented:

If Problem is not NULL then RED, ELSE BLUE.

You should add AND condition while checking for NULL.

        if(problem != null  &&  problem != "")
                          bg = "red";    
                          bg = "blue"; 

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BobHavertyComhAuthor Commented:
I knew it was something stupid where I just needed a second pair of eyes. I was working for too long yesterday and my brain apparently fought back. Thanks a bunch.
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