Enumerate Site collection and Site Content Types

I will be creating a web part that enumerates root site and all it's subsites content types along with their columns.

We will be using a Tree View control for this.

using System; using System.Collections.Generic; using System.Text; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using Microsoft.SharePoint; using Microsoft.SharePoint.Administration; using Microsoft.SharePoint.WebControls; /// <summary>         /// Shows content types recursively         /// </summary>         /// <param name="oWeb">The parent node</param>         /// <param name="oNode">The content Type node</param>         protected void ShowCTypes(SPWeb oWeb, TreeNode oNode, SPContentTypeId contTypeID)         {             TreeNode oSubNode = null;             SPContentTypeCollection oCTypeColl = oWeb.ContentTypes;             foreach (SPContentType conttype in oCTypeColl)             {                 //if current type is child of parameter oNode and is not the root ctype                 if (conttype.Parent.Id == contTypeID && conttype.Parent.Id != conttype.Id)                 {                     oSubNode = new TreeNode(conttype.Name);                     oSubNode.NavigateUrl = oWeb.ServerRelativeUrl + "/_layouts/ManageContentType.aspx?cType=" + conttype.Id;                     oSubNode.Target = "_blank";                     //add columns                     ShowCtypeColumns(oSubNode, conttype);                     //add subnodes                     oNode.ChildNodes.Add(oSubNode);                     //now oSubNode is the parent node                     ShowCTypes(oWeb, oSubNode, conttype.Id);                 }             }         }         /// <summary>         /// Shows columns for a content type         /// </summary>         /// <param name="oNode">Current content type Treenode</param>         /// <param name="contType">Content type whose columns are to be added</param>         protected void ShowCtypeColumns(TreeNode oNode, SPContentType contType)         {             TreeNode oSubNode = null;             //fetch fields of content type             SPFieldCollection oFldColl = contType.Fields;             if (oFldColl.Count != 0)                 oNode.ChildNodes.Add(new TreeNode("Columns"));             foreach (SPField oField in oFldColl)             {                 if (!oField.Title.Equals("ContentType") && !oField.Hidden)                 {                     oSubNode = new TreeNode(oField.Title);                     oSubNode.NavigateUrl = contType.ParentWeb.ServerRelativeUrl + "/_layouts/ManageContentTypeField.aspx?cType=" + contType.Id + "&Field=" + oField.InternalName + "&Fid=" + oField.Id;                     oSubNode.Target = "_blank";                     oNode.ChildNodes[0].ChildNodes.Add(oSubNode);                 }             }         } /// <summary>         /// Creates Treeview nodes for content types and features.         /// </summary>         protected void CreateControls()         {             SPSecurity.RunWithElevatedPrivileges(delegate()             {                 TreeView1.Nodes.Clear();                 TreeView1.Nodes.Add(new TreeNode("Content Types"));                 //get the name of the current web in current user's context                 string spSiteURL = SPControl.GetContextSite(Context).Url.ToString();                 //Initialize the spweb object using the elevated privileges                 using (SPSite oSite = new SPSite(spSiteURL))                 {                     SPWebCollection oWebColl = oSite.AllWebs;                     #region Add content types                     TreeNode oSiteNode = null;                     foreach (SPWeb oWeb in oWebColl)                     {                         //create website nodes                         oSiteNode = new TreeNode(oWeb.Title);                         oSiteNode.NavigateUrl = oWeb.Url;                         //get contenttypes collection for each subsite including root site                         SPContentTypeCollection oCTypeColl = oWeb.ContentTypes;                         TreeNode oNode = new TreeNode();                         //if site doesn't have any Ctypes (only content types defined for that particular site are displayed)                         if (oCTypeColl.Count != 0)                         {                             oNode.Text = oCTypeColl[0].Name;                             oNode.NavigateUrl = oWeb.ServerRelativeUrl + "/_layouts/ManageContentType.aspx?cType=" + oCTypeColl[0].Id.ToString();                             oNode.Target = "_blank"; //opens link in new window                             //send current site and root contenttype node (not the actual content type)                             ShowCTypes(oWeb, oNode, oCTypeColl[0].Id);                             //add root contenttype node to website node                             oSiteNode.ChildNodes.Add(oNode);                         }                         //add website node to root node of treeview.                         TreeView1.Nodes[0].ChildNodes.Add(oSiteNode);                         oWeb.Dispose();                     }                     #endregion   TreeView1.CollapseAll();                     oSite.Dispose();                 }             } //end of delegate             ); //end of RunWithElevatedPrivileges         }         protected override void OnPreRender(EventArgs e)         {             CreateControls();         }         protected override void CreateChildControls()        {             //add control to treeview             this.Controls.Add(TreeView1);         }         protected override void RenderContents(HtmlTextWriter writer)         {             //render treeview control             TreeView1.RenderControl(writer);         }     } }