someone who can help me!!

[C# Programming]

foreach (DataRow dr in ds.Tables[0])
{
string colName = dr["a"].ToString();
TreeNode node = treeView1.Find(colName);
if (node == null)
{
node = treeView1.Nodes.Add(colName, colName);
}
node.Nodes.Add(dr["b"].ToString());
}
when runing the code it shows:
"System.Windows.Forms.TreeView" does not contain a "Find" Definition?
can someone help me
very thanks!!@