How to bind database using LIST? - asp.net

Question

Hi iam try to Get Database data and showed in RadTreeview,
here i got one sample,that sample like default sample,every Root and Child has to be enter manually,
but i want bind from database,values are filled automatically(root/child)
i will show that example code,
List<SiteDataItem> siteData = new List<SiteDataItem>();
siteData.Add(new SiteDataItem(1, 0, "Products"));
siteData.Add(new SiteDataItem(2, 1, "RadControls for ASP.NET Ajax"));
siteData.Add(new SiteDataItem(3, 1, "RadControls for Silverlight"));
siteData.Add(new SiteDataItem(4, 2, "RadGrid"));
siteData.Add(new SiteDataItem(5, 2, "RadScheduler"));
siteData.Add(new SiteDataItem(6, 2, "RadEditor"));
siteData.Add(new SiteDataItem(7, 3, "RadGrid"));
siteData.Add(new SiteDataItem(8, 3, "RadMenu"));
siteData.Add(new SiteDataItem(9, 3, "RadEditor"));
RadTreeView1 .DataTextField = "Text";
RadTreeView1.DataFieldID = "ID";
RadTreeView1.DataFieldParentID = "ParentID";
RadTreeView1.DataSource = siteData;
RadTreeView1.DataBind();
Please help me to do as i want

Answer 1

Please try with the below code snippet.
protected void Page_Load(object sender, System.EventArgs e)
{
List<TestModels> models = new List<TestModels>();
models.Add(new TestModels() { ID = 1, ParentID = null, Text = "a1" });
models.Add(new TestModels() { ID = 2, ParentID = 1, Text = "a2" });
models.Add(new TestModels() { ID = 3, ParentID = 2, Text = "a3" });
models.Add(new TestModels() { ID = 4, ParentID = null, Text = "a4" });
models.Add(new TestModels() { ID = 5, ParentID = 4, Text = "a5" });
RadTreeView1.DataTextField = "Text";
RadTreeView1.DataFieldID = "ID";
RadTreeView1.DataFieldParentID = "ParentID";
RadTreeView1.DataSource = models;
RadTreeView1.DataBind();
}
Class
public class TestModels
{
public int ID { get; set; }
public int? ParentID { get; set; }
public string Text { get; set; }
}
Please Set NULL in ParentID in place-of 0.
Because It consider 0 as value. RadTreeView is not able to found any ID field which have 0 value.

Answer 2

You can try something like this.
DataTable data= GetDataFromDatabase()
RadTreeView1.DataTextField = "TextFieldwhichyouwantshow";
RadTreeView1.DataFieldID = "IDFromdatabase";
RadTreeView1.DataFieldParentID = "ParentIDFromDatabase";
RadTreeView1.DataSource = data;
RadTreeView1.DataBind();