using System;
using System.Collections.Generic;
using Microsoft.SharePoint;
namespace Test
{
class ConsoleApp
{
static void Main(string[] args)
{
using (SPSite siteCollection = new SPSite("http://localhost"))
{
using (SPWeb webSite = siteCollection.OpenWeb())
{
// Get the obsolete content type.
SPContentType obsolete = webSite.ContentTypes["Test"];
// We have a content type.
if (obsolete != null)
{
IList usages = SPContentTypeUsage.GetUsages(obsolete);
// It is in use.
if (usages.Count > 0)
{
Console.WriteLine("The content type is in use in the following locations:");
foreach (SPContentTypeUsage usage in usages)
Console.WriteLine(usage.Url);
}
// The content type is not in use.
else
{
// Delete it.
Console.WriteLine("Deleting content type {0}...", obsolete.Name);
webSite.ContentTypes.Delete(obsolete.Id);
}
}
// No content type found.
else
{
Console.WriteLine("The content type does not exist in this site collection.");
}
}
}
Console.Write("\nPress ENTER to continue...");
Console.ReadLine();
}
}
}
Create a Console Application with the above code and run that project. This code will tell you the libraries in which the content types are attached. Then simply go that libraries and delete the attached content types. Then finally delete the content type from Site Actions -> Site Settings -> Site Content Types or you may use the above code as well to delete the content type.
This worked for me hope it may also work for you !!!
Thanks.