How do I check if a column exists in SQL Server?

IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.COLUMNS
WHERE  TABLE_NAME='tablename' AND COLUMN_NAME='columname' )

SELECT count(*) AS [Column Exists]
FROM SYSOBJECTS
INNER JOIN SYSCOLUMNS ON SYSOBJECTS.ID = SYSCOLUMNS.ID
WHERE
 SYSOBJECTS.NAME = 'myTable'
 AND SYSCOLUMNS.NAME = 'Myfield'

If col_length('table_name','column_name') is null
    select 0 as Present
ELSE
    select 1 as Present

if COLUMNPROPERTY(object_id('table_name'), 'column_name', 'ColumnId') is null
  print 'doesn't exist'
else
  print 'exists'