Return office details from multiple tables
First of all, kudos for using a Parameter and not concatenating the value into your T-SQL string.

You're not disposing all IDisposable objects. SqlDataReader should be disposed as well. Now this makes it quite a bunch of nested using scopes, which you could rework like this:

    using (var connection = new SqlConnection(Settings.ConnectionString))
    using (var command = new SqlCommand(sql, connection))
    {
        command.CommandType = CommandType.Text;
        command.Parameters.AddWithValue("@syncID", syncId);
        connection.Open();

        using (var reader = command.ExecuteReader())
        {
            if (reader.Read())
            {
                this.OfficeName = reader.GetString(1);
            }
        }
    }


Note:


Usage of var for implicit typing makes the code easier to read (IMO), if you're using C# 3.0+
Disemvoweling is bad. There's no reason to call a variable rdr over reader. Use meaningful names, always.
Hungarian notation is evil. There's no reason to prefix a string with str.
Stick to camelCasing for locals - that includes parameters, so syncID becomes syncId.


The code assumes the query only returns 1 row, but the query isn't written to explicitly select a single row. This could lead to unexpected results.

Given some IList&lt;string&gt; results = new List&lt;string&gt;();:

        using (var reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                results.Add(reader.GetString(1));
            }
        }


You could then do this.OfficeName = results.Single(); (which would blow up if no rows were returned). One thing that strikes me, is that you're selecting 2 fields, but only using 1, which makes this reader.GetString(1) statement look surprising. If you don't need to select the SyncID field, remove it from your query and do reader.GetString(0) instead.

Finally, the T-SQL itself:

Select so.SyncID, so.title
From Offices o
Left Outer Join SyncOffices so On so.id = o.SyncID
Where o.SyncID = @syncID


Could look like this:

SELECT so.Title
FROM Offices o
LEFT JOIN SyncOffices so ON so.id = o.SyncID
WHERE o.SyncID = @syncID


Or, in a string:

var sql = "SELECT so.Title FROM Offices o LEFT JOIN SyncOffices so ON so.Id = o.SyncId WHERE o.SyncId = @syncId";


The line breaks make it look weird, and since it's not too long of a query, I think it would make the code better to have it on a single line.