How to make a SharePoint list column ReadOnly using Sharepoint designer

Question

Hi,
         I am new to sharepoint. Need to make a few columns readonly in a sharepoint list.  Not sure how. Any help is appreciated.
Thanks

Answer 1

Here is one more Simple and Best practice to be fallowed using powershell
http://soreddymanjunath.blogspot.in/2014/04/readonly-field-using-powershell.html
Cls
Add-PSSnapin "Microsoft.Sharepoint.Powershell"
$web= Get-SPWeb -Identity "http://test.dev/sites/Wftest"
$ls=$web.Lists.TryGetList("test");
$flds=$ls.Fields["CustID"]
$flds.ReadOnlyField=$true
$flds.Update();
Note:  If
ReadOnlyField =TRUE,
the field is not displayed in New or Edit forms 
ReadOnly to TRUE hides
the field from Site Settings pages for managing site columns and content types. Setting the Hidden attribute
to TRUE completely
hides the field from the UI. 
Default  ReadOnlyField value
is set to false.
Best Practice is to Use 
$flds.ShowInDisplayForm=$false;
$flds.ShowInEditForm=$false;