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Placing RadTreeView in GridTemplateColumn of RadGrid


There are cases in which you may want to show a treeview-like structure inside ItemTemplate of GridTemplateColumn. This article will show how to place a RadTreeView in GridTemplateColumn of RadGrid.


This task is pretty much straight-forward. You just need to wrap RadTreeView instance inside the ItemTemplate of your GridTemplateColumn and configure it to display the data you would like to present for the end user.
The sample code below shows how to render Locations loaded from XML content file in TreeView object (embedded in RadGrid instance):

<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
        <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js">
        <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js">
        <asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js">
    <telerik:RadGrid ID="RadGrid1" runat="server" OnItemDataBound="RadGrid1_ItemDataBound"
        CellSpacing="0" GridLines="None" OnNeedDataSource="RadGrid1_NeedDataSource">
        <MasterTableView AllowSorting="true" AutoGenerateColumns="false">
                <telerik:GridBoundColumn HeaderText="CompanyName" DataField="CompanyName" UniqueName="CompanyName">
                <telerik:GridTemplateColumn UniqueName="TemplateColumn" HeaderText="Locations" ItemStyle-Width="350px"
                    ItemStyle-Height="70px" ItemStyle-VerticalAlign="Top">
                        <telerik:RadTreeView ID="RadTreeView1" runat="server">
protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    if (e.Item is GridDataItem)
        RadTreeView tree = (RadTreeView)e.Item.FindControl("RadTreeView1");

protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
    RadGrid1.DataSource = GetDataTable("SELECT TOP 7 CompanyName FROM Customers");

public DataTable GetDataTable(string query)
    String ConnString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
    SqlConnection conn = new SqlConnection(ConnString);
    SqlDataAdapter adapter = new SqlDataAdapter();
    adapter.SelectCommand = new SqlCommand(query, conn);

    DataTable myDataTable = new DataTable();


    return myDataTable;

````VB               Protected Sub RadGrid1_ItemDataBound(sender As Object, e As GridItemEventArgs) Handles RadGrid1.ItemDataBound If TypeOf (e.Item) Is GridDataItem Then Dim tree As RadTreeView = CType(e.Item.FindControl("RadTreeView1"), RadTreeView) tree.LoadContentFile("tree.xml") End If End Sub

Protected Sub RadGrid1_NeedDataSource(sender As Object, e As GridNeedDataSourceEventArgs) Handles RadGrid1.NeedDataSource RadGrid1.DataSource = GetDataTable("SELECT TOP 7 CompanyName FROM Customers") End Sub

Public Function GetDataTable(ByVal query As String) As DataTable Dim ConnString As String = ConfigurationManager.ConnectionStrings("NorthwindConnectionString").ConnectionString Dim conn As SqlConnection = New SqlConnection(ConnString) Dim adapter As SqlDataAdapter = New SqlDataAdapter adapter.SelectCommand = New SqlCommand(query, conn) Dim table1 As New DataTable conn.Open() Try adapter.Fill(table1) Finally conn.Close() End Try Return table1 End Function

You can download the sample project from here.

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