How do I list or search all the column names in my database?
You can use following query to list all columns or search columns across tables in a database.

USE AdventureWorks 
GO 
SELECT t.name AS table_name,
SCHEMA_NAME(schema_id) AS schema_name,
c.name AS column_name
FROM sys.tables AS t
INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID
WHERE c.name LIKE '%EmployeeID%'
ORDER BY schema_name, table_name; 


You can make use of  information_schema views to list all objects in SQL Server 2005 or 2008 databases.

SELECT * FROM information_schema.tables

SELECT * FROM information_schema.columns


http://blog.sqlauthority.com/2008/08/06/sql-server-query-to-find-column-from-all-tables-of-database/