1. Create a new project with RadGridView
2. Create an empty self-referencing data table
3. Set a self reference hierarchy by calling the AddSelfReference method
4. Add two rows in the table
5. Run the application and you will see that only one of the rows is visible.
DataTable table = new DataTable();
table.Columns.Add("Id", typeof(long));
table.Columns.Add("ParentId", typeof(long));
table.Columns.Add("Name", typeof(String));
gridView.DataSource = table;
gridView.Relations.AddSelfReference(this.gridView.MasterTemplate, "Id", "ParentId");
DataRow row = table.NewRow();
row["Id"] = 1;
row["ParentId"] = DBNull.Value;
row["Name"] = "Name1";
table.Rows.Add(row);
row = table.NewRow();
row["Id"] = 2;
row["ParentId"] = DBNull.Value;
row["Name"] = "Name2";
table.Rows.Add(row);
row = table.NewRow();
row["Id"] = 3;
row["ParentId"] = 2;
row["Name"] = "Name2";
table.Rows.Add(row);