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‎knowledge-base/grid-custom-filtering-self-referencing-hierarchy.md‎

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---
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title: Filtering Child Rows in Self-referencing Hierarchy While Keeping Parent Row Visible
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description: Learn how to filter rows in a self-referencing hierarchical RadGridView while keeping parent rows visible when child rows match the filter condition.
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type: how-to
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page_title: Filtering Self-referencing Hierarchical RadGridView with Parent Row Visibility
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meta_title: Filtering Self-referencing Hierarchical RadGridView with Parent Row Visibility
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slug: grid-custom-filtering-self-referencing-hierarchy
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tags: gridview, ui-for-winforms, filtering, custom-filtering, self-referencing-hierarchy
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res_type: kb
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ticketid: 1700615
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---
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## Environment
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|Product Version|Product|Author|
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|----|----|----|
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|2025.3.812|RadGridView for WinForms|[Nadya Karaivanova](https://www.telerik.com/blogs/author/nadya-karaivanova)|
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## Description
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This knowledge base article shows how to filter rows in a self-referencing hierarchical RadGridView using custom filtering while keeping parent rows visible as long as any child rows match the filter condition.
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## Solution
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To achieve hierarchical filtering that retains parent rows when child rows match, use the **CustomFiltering** event and implement recursive filtering logic for the child rows. Follow these steps:
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1. Subscribe to the **CustomFiltering** event of the RadGridView.
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2. Implement a recursive method to evaluate each row and its child rows against the filter condition.
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3. Set the filtering logic so that parent rows remain visible if any matching child rows are found.
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### Example: Filtering Child Rows in Self-referencing Hierarchy While Keeping Parent Row Visible
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````C#
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public Form1()
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{
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InitializeComponent();
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this.radGridView1.MasterTemplate.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
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this.radGridView1.DataSource = CreateDataSource();
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this.radGridView1.Relations.AddSelfReference(this.radGridView1.MasterTemplate, "ID", "ParentID");
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this.radGridView1.Columns["ID"].IsVisible = false;
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this.radGridView1.Columns["ParentID"].IsVisible = false;
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this.radGridView1.Columns["Size"].FormatString = "{0} MB";
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this.radGridView1.EnableFiltering = true;
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this.radGridView1.MasterTemplate.EnableFiltering = true;
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this.radGridView1.EnableCustomFiltering = true;
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this.radGridView1.CustomFiltering += new GridViewCustomFilteringEventHandler(radGridView1_CustomFiltering);
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this.radTextBox1.TextChanged += RadTextBox1_TextChanged;
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}
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private void RadTextBox1_TextChanged(object sender, EventArgs e)
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{
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this.radGridView1.MasterTemplate.Refresh();
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}
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private void radGridView1_CustomFiltering(object sender, GridViewCustomFilteringEventArgs e)
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{
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string searchString = this.radTextBox1.Text;
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if (string.IsNullOrEmpty(searchString))
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{
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e.Visible = true;
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e.Row.IsVisible = true;
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return;
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}
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string columnName_cellValue = e.Row.Cells["Name"].Value.ToString();
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bool parentContains = false;
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foreach (var childRow in e.Row.ChildRows)
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{
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string text = childRow.Cells["Name"].Value?.ToString() ?? "";
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if (childRow.ChildRows.Count> 0)
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{
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foreach (var innerRow in childRow.ChildRows)
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{
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text = innerRow.Cells["Name"].Value?.ToString() ?? "";
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if (text.Contains( searchString))
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{
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e.Visible = true;
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e.Row.IsVisible = true;
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parentContains = true;
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}
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else
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{
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e.Visible = false;
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e.Row.IsVisible = false;
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}
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}
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}
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else
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{
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if (text.Contains(searchString))
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{
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e.Visible = true;
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e.Row.IsVisible = true;
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parentContains = true;
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}
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else
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{
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e.Visible = false;
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e.Row.IsVisible = false;
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}
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}
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}
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if (!parentContains)
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{
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if (columnName_cellValue.Contains(searchString))
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{
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e.Visible = true;
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e.Row.IsVisible = true;
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}
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else
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{
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e.Visible = false;
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e.Row.IsVisible = false;
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}
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}
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e.Handled = true;
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}
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private static DataTable CreateDataSource()
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{
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DataTable dataSource = new DataTable("fileSystem");
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dataSource.Columns.Add("ID", typeof(int));
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dataSource.Columns.Add("ParentID", typeof(int));
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dataSource.Columns.Add("Name", typeof(string));
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dataSource.Columns.Add("Date", typeof(DateTime));
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dataSource.Columns.Add("Type", typeof(string));
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dataSource.Columns.Add("Size", typeof(int));
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dataSource.Rows.Add(1, null, "Program Files", DateTime.Now.AddDays(-100), "Folder", 5120);
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dataSource.Rows.Add(2, 1, "Visual Studio 2010", DateTime.Now.AddDays(-100), "Folder", 3220);
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dataSource.Rows.Add(3, 2, "bin", DateTime.Now.AddDays(-100), "Folder", 3220);
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dataSource.Rows.Add(4, 2, "READEME.txt", DateTime.Now.AddDays(-100), "Text Document", 3);
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dataSource.Rows.Add(5, 1, "Telerik RadControls", DateTime.Now.AddDays(-10), "Folder", 3120);
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dataSource.Rows.Add(6, 5, "Telerik UI for Winforms", DateTime.Now.AddDays(-10), "Folder", 101);
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dataSource.Rows.Add(7, 5, "Telerik UI for Silverlight", DateTime.Now.AddDays(-10), "Folder", 123);
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dataSource.Rows.Add(8, 5, "Telerik UI for WPF", DateTime.Now.AddDays(-10), "Folder", 221);
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dataSource.Rows.Add(9, 5, "Telerik UI for ASP.NET AJAX", DateTime.Now.AddDays(-10), "Folder", 121);
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dataSource.Rows.Add(10, 1, "Microsoft Office 2010", DateTime.Now.AddDays(-120), "Folder", 1230);
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dataSource.Rows.Add(11, 10, "Microsoft Word 2010", DateTime.Now.AddDays(-120), "Folder", 1230);
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dataSource.Rows.Add(12, 10, "Microsoft Excel 2010", DateTime.Now.AddDays(-120), "Folder", 1230);
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dataSource.Rows.Add(13, 10, "Microsoft Powerpoint 2010", DateTime.Now.AddDays(-120), "Folder", 1230);
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dataSource.Rows.Add(14, 1, "Debug Diagnostic Tools v1.0", DateTime.Now.AddDays(-400), "Folder", 2120);
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dataSource.Rows.Add(15, 1, "Designer's 3D Tools", DateTime.Now.AddDays(-500), "Folder", 1120);
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dataSource.Rows.Add(16, 1, "Communication", DateTime.Now.AddDays(-700), "Folder", 120);
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dataSource.Rows.Add(17, null, "My Documents", DateTime.Now.AddDays(-200), "Folder", 1024);
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dataSource.Rows.Add(18, 17, "Salaries.xlsx", DateTime.Now.AddDays(-200), "Excel File", 1);
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dataSource.Rows.Add(19, 18, "RecessionAnalysis.xlsx", DateTime.Now.AddDays(-200), "Excel File", 1);
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dataSource.Rows.Add(20, null, "Windows", DateTime.Now.AddDays(-100), "Folder", 10240);
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dataSource.Rows.Add(21, 20, "System32", DateTime.Now.AddDays(-220), "Folder", 510);
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dataSource.Rows.Add(22, 20, "assembly", DateTime.Now.AddDays(-20), "Folder", 240);
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dataSource.Rows.Add(23, 22, "System.Data.dll", DateTime.Now.AddDays(-20), "Assembly File", 4);
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dataSource.Rows.Add(24, 22, "System.Core.dll", DateTime.Now.AddDays(-20), "Assembly File", 2);
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dataSource.Rows.Add(25, 22, "System.Drawings.dll", DateTime.Now.AddDays(-20), "Assembly File", 3);
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dataSource.Rows.Add(26, 22, "Telerik.WinControls.UI.dll", DateTime.Now.AddDays(-20), "Assembly File", 5);
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dataSource.Rows.Add(27, null, "Users", DateTime.Now.AddDays(-100), "Folder", 5512);
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dataSource.Rows.Add(28, 27, "Administrator", DateTime.Now.AddDays(-100), "Folder", 1512);
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dataSource.Rows.Add(29, 27, "Guest", DateTime.Now.AddDays(-100), "Folder", 2512);
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dataSource.Rows.Add(30, 27, "User1", DateTime.Now.AddDays(-100), "Folder", 3512);
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dataSource.Rows.Add(31, null, "Share", DateTime.Now.AddDays(-50), "Folder", 15360);
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dataSource.Rows.Add(32, 31, "Photos", DateTime.Now.AddDays(-50), "Folder", 360);
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dataSource.Rows.Add(33, 32, "Flowers.JPG", DateTime.Now.AddDays(-50), "JPEG File", 1);
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dataSource.Rows.Add(34, 32, "Panda.GIF", DateTime.Now.AddDays(-50), "GIF File", 3);
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dataSource.Rows.Add(35, 32, "Landscape.png", DateTime.Now.AddDays(-50), "PNG File", 4);
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dataSource.Rows.Add(36, null, "Music", DateTime.Now.AddDays(-2), "Folder", 0);
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dataSource.Rows.Add(37, 36, "Mozart", DateTime.Now.AddDays(-3), "Folder", 0);
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dataSource.Rows.Add(38, 36, "Pavarotti", DateTime.Now.AddDays(-40), "Folder", 0);
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dataSource.Rows.Add(39, 36, "AC/DC", DateTime.Now.AddDays(-50), "Folder", 0);
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dataSource.Rows.Add(40, 36, "Queen", DateTime.Now.AddDays(-8), "Folder", 0);
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dataSource.Rows.Add(41, null, "Boot.ini", DateTime.Now.AddDays(-10), "INI File", 0);
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return dataSource;
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}
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````
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## See Also
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* [Custom Filtering](https://docs.telerik.com/devtools/winforms/controls/gridview/features/filtering/custom-filtering)

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