Just like binding with relational lists, TreeView can be bound to relational datasets, where relationships are defined between individual tables. The TreeView control can automatically generate the KeyField and ParentKeyField properties from the relations in the dataset. This also helps in displaying the tables hierarchically by setting the DataSource and DataMemberPath properties of BindingInfo class.

The image below depicts dataset binding in the TreeView control.

To bind TreeView to a DataSet, follow these steps:

1. Set the datasource for TreeView using the DataSource property. Note that here we fetch the data from the DataSet class using the GetData method. You can find the code for DataSet class here.

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   c1TreeView1.BindingInfo.DataSource = GetData();

2. Set the data members for tree levels.

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   // set the data member path c1TreeView1.BindingInfo.DataMemberPath.Add(0, "Customers"); c1TreeView1.BindingInfo.DataMemberPath.Add(1, "Orders"); c1TreeView1.BindingInfo.DataMemberPath.Add(2, "OrderDetail");

3. Configure and add the columns to be displayed in the TreeView. Set the DisplayFieldName property to get the list of fields to be displayed in the columns and the DisplayMemberPath property to get a collection that identifies the fields to be displayed in a column depending on the node level.

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   // configure columns // ID var column = c1TreeView1.Columns[0]; column.DisplayFieldName = "ID"; column.HeaderText = "ID"; // Customer info column = new C1.Win.TreeView.C1TreeColumn(); column.DisplayMemberPath.Add(0, "Name"); column.DisplayMemberPath.Add(1, "CustomerID"); column.DisplayMemberPath.Add(2, "OrderID"); column.HeaderText = "Customer info"; c1TreeView1.Columns.Add(column); // Order Info column = new C1.Win.TreeView.C1TreeColumn(); column.DisplayMemberPath.Add(0, "Address"); column.DisplayMemberPath.Add(1, "Date"); column.DisplayMemberPath.Add(2, "Qty"); column.HeaderText = "Order Info"; c1TreeView1.Columns.Add(column);