asp.net gets the first selected node in TreeView

private TreeNode GetSelectedGroup(TreeView tv) 
{ 
foreach (TreeNode item in tv.Nodes) 
{ 
if (item.Checked) 
{ 
return item; 
} 
else 
{ 
return GetSelectedChildGroup(item); 
} 
} 
return null; 

} 

TreeNode result = null; 
private TreeNode GetSelectedChildGroup(TreeNode treeNode) 
{ 
foreach (TreeNode item in treeNode.ChildNodes) 
{ 
if (item.Checked) 
{ 
return item; 
} 
else 
{ 
result = GetSelectedChildGroup(item); 
} 
} 
return result; 
}