How to load data from database to TreeView

Introduction

How to load data from database into the Treeview control

1-Create two table as show below

Table ParentTable

ChildTable

2-Add some data

ParentTable

ChildTable

Drag and drap a TreeView control on the web page

As show below

3-Copy the below listed code in the aspx.cs page

//Code Detail          
protected void Page_Load(object sender, EventArgs e)

{

fill_Tree2();

}
        

void fill_Tree2()

{



DataSet PrSet = PDataset("Select * from ParentTable");

TreeView1.Nodes.Clear();

foreach (DataRow dr in PrSet.Tables[0].Rows)

{

TreeNode tnParent = new TreeNode();

tnParent.Text = dr["ParentName"].ToString();

tnParent.Value = dr["ParentID"].ToString(); 

tnParent.PopulateOnDemand = true;

tnParent.ToolTip = "Click to get Child";

tnParent.SelectAction = TreeNodeSelectAction.SelectExpand;

tnParent.Expand();

tnParent.Selected = true;

TreeView1.Nodes.Add(tnParent);

FillChild(tnParent, tnParent.Value);

}

 

}

public void FillChild(TreeNode parent,string ParentId)

{

DataSet ds = PDataset("Select * from ChildTable where ParentId =" + ParentId);

parent.ChildNodes.Clear();

foreach (DataRow dr in ds.Tables[0].Rows)

{

TreeNode child = new TreeNode();

child.Text = dr["ChildName"].ToString().Trim();

child.Value = dr["ChildId"].ToString().Trim();

if (child.ChildNodes.Count == 0)

{

child.PopulateOnDemand = true;

}

child.ToolTip = "Click to get Child";

child.SelectAction = TreeNodeSelectAction.SelectExpand;

child.CollapseAll();

parent.ChildNodes.Add(child);

}

}

 

protected DataSet PDataset(string Select_Statement)

{

SqlConnection SqlCon = new SqlConnection("Data Source=;Integrated Security=True");

SqlDataAdapter ad = new SqlDataAdapter(Select_Statement, SqlCon);

DataSet ds = new DataSet();

ad.Fill(ds);

return ds;

 

}

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