New to C# - Need a code check

Question

Hello, thank you for reading.  I'm brand new to C# and C # Corner.

 

I'm working on submitting an invoice via XML, however I keep getting an error on the XmlReader line (line 13). I know the Sql connection and properties are correct becuase I copied them over from another connection in my solution that I know works.

 

Not sure what I'm missing, anyhelp would be greatly appreaciated! 

public void SubmitInvoice()
 {
     SqlConnection myConnection = null;
     try
     {
         // Create Instance of Connection and Command Object
         myConnection = new SqlConnection(Settings.connectString);
         SqlCommand myCommand = new SqlCommand("usp_Get_Invoice", myConnection);
         myCommand.CommandType = CommandType.StoredProcedure;
         myCommand.CommandTimeout = 300;
         myConnection.Open();

         XmlReader results = myCommand.ExecuteXmlReader();
         if (results.Read())