Using LIKE operator doesnt return results

Hi

I'm very new to SQL and databases in general. I have a vb.NET app in which I'm trying to send a SQL server to a SQL Server 2012 server.

For testing purposes Im using SQL SErver Management studio. I have one query that works, but when I try to use the exact same query using wildcard in the statement, it returns no results even though I know for a fact that the table contains such values.

This works:

SELECT number

FROM casenumber

WHERE number = '100510'

This, for some reason, does NOT work:

SELECT number

FROM casenumber

WHERE number LIKE '100%'

What am I doing wrong? Help, pretty please? Many thanks in advance!