SharePoint

Use the below code: using (SPSite mySite = new SPSite("siteURL")) { using (SPWeb myWeb = mySite.OpenWeb()) { SPList myList = myWeb.Lists["ListName"]; SPField myField = myList.Fields["ColName"]; myField.ReadOnlyField = true; myField.Update(); } } With this code, the column becomes read-only. This column does not appear while adding new item or editing existing item, and also in the list of columns in List settings. But, you can add this column to a view, so, user can see the data. Also, programmatically, you can add/update a value to this column (That means, it is set to read-only from SharePoint UI point of view) One use of this approach is when you want to introduce auto-generated number column.