System.Web.UI.WebControls.DataGrid.AddColumnsFromSource C# (CSharp) Method

		void AddColumnsFromSource (PagedDataSource data_source)
		{
			PropertyDescriptorCollection props = null;
			Type ptype = null;
			bool no_items = false;

			// Use plain reflection for the Item property.
			// If we use TypeDescriptor, props will hold
			// all of the Type properties, which will be listed as columns
			Type ds_type = data_source.GetType ();
			PropertyInfo pinfo = ds_type.GetProperty ("Item", item_args);
			if (pinfo == null) {
				IEnumerator items = (data_source.DataSource != null) ? data_source.GetEnumerator () : null;
				if (items != null && items.MoveNext ()) {
					object data = items.Current;
					if ((data is ICustomTypeDescriptor) || (!IsBindableType(data.GetType())))
						props = TypeDescriptor.GetProperties (data);
					else if (data != null)
						ptype = data.GetType ();
					data_enumerator = items;
				} else {
					no_items = true;
				}
			} else {
				ptype = pinfo.PropertyType;
			}

			if (ptype != null) {
				// Found the "Item" property
				AddPropertyToColumns ();
			} else if (props != null) {
				foreach (PropertyDescriptor pd in props)
					AddPropertyToColumns (pd, false);
			} else if (!no_items) {
				// This is not thrown for an empty ArrayList.
				string msg = String.Format ("DataGrid '{0}' cannot autogenerate " +
							"columns from the given datasource. {1}", ID, ptype);
				throw new HttpException (msg);
			}
		}