Filter.ascx.cs

using CMS.DocumentEngine.Web.UI;
using CMS.Helpers;
using CMS.Taxonomy;
using System;
using System.Web.UI.WebControls;

public partial class CMSWebParts_MySite_Filters_Filter : CMSAbstractDataFilterControl
{
    protected override void OnInit(EventArgs e)
    {
        SetupControl();
        base.OnInit(e);
    }

    protected override void OnPreRender(EventArgs e)
    {
        SetFilter();
        base.OnPreRender(e);
    }

    private void SetupControl()
    {
        if (this.StopProcessing)
        {
            this.Visible = false;
        }

        else if (!RequestHelper.IsPostBack())
        {
            InitializeCategories();
        }
    }

    private void InitializeCategories()
    {
        CategoryInfo parent = CategoryInfoProvider.GetCategoryInfo("MyCategory", CurrentSite.SiteName);
        var categories = CategoryInfoProvider.GetChildCategories(parent.CategoryID, null, "CategoryOrder ASC", 0, "CategoryDisplayName, CategoryID", CurrentSite.SiteID).Execute();

        if (!DataHelper.DataSourceIsEmpty(categories))
        {
            this.ddlCategories.DataSource = categories;
            this.ddlCategories.DataTextField = "CategoryDisplayName";
            this.ddlCategories.DataValueField = "CategoryID";

            this.ddlCategories.DataBind();

            this.ddlCategories.Items.Insert(0, new ListItem("Any Category", ""));
        }
    }

    // SetFilter and other methods removed for brevity
}