title: cannot open user default database. login failed error
body: <p>I am getting this "cannot open user default database. login failed" error.  What I did was using ORM to create DataContext, in the code first call TableExists function to check if the version_tbl existed, if not, then call scripts to exec sql commands to create version_tbl.  Then create a new dataContext, but problem is after the call I am getting this error on dataContext entity.  If I remove the TableExists call, then dataContext creation is fine or move the dataContext creation before the TableExists call, but then the problem occurs in the TableExists call when it tries to connect.  Seems like I can only connect once.  Anyway I can call TableExists then able to create dataContext?</p>
  
  <p>Below is my code sample</p>
  
  <p>static bool TableExists(string tableName)
     {</p>
  
  <pre><code>        using (SqlConnection connection = new SqlConnection("Data Source=localhost\\SQLEXPRESS;Initial Catalog=planning;Integrated Security=True"))
          {
  
              string checkTable =
  
                 String.Format(
  
                    "IF OBJECT_ID('{0}', 'U') IS NOT NULL SELECT 'true' ELSE SELECT 'false'",
  
                    tableName);
  
  
  
              SqlCommand command = new SqlCommand(checkTable, connection);
  
              command.CommandType = CommandType.Text;
  
              connection.Open();
  
              bool retVal = Convert.ToBoolean(command.ExecuteScalar());                
  
              return retVal;
  
    }
  </code></pre>
  
  <p>}</p>
  
  <pre><code>myFunc ()
  {
  if (!TableExists ("version_tbl"))
  {
  // call scripts to create version_tbl
  }
  
  DataContext ctx = new DataContext ();
  </code></pre>