How to Set focus programmatically on Treeview node

[Sudip_inn]

see the code which i am using to move up and down selected node but after move up and down some time i see selection on selected node goes out. so please tell me what to change in my code as a result selection should not go from selected cell after movement up/down ? here is code

/// <summary>
/// Move Selected Node Up in TreeNode Collection
/// </summary>
/// <param name="node"></param>
public static void MoveUp(this TreeNode node)
{
TreeNode parent = node.Parent;
TreeView view = node.TreeView;

if (parent != null)
{
int index = parent.Nodes.IndexOf(node);
if (index > 0)
{
parent.Nodes.RemoveAt(index);
parent.Nodes.Insert(index - 1, node);
node.Text = node.Text;
}
}
else if (node.TreeView.Nodes.Contains(node)) //root node
{
int index = view.Nodes.IndexOf(node);
if (index > 0)
{
view.Nodes.RemoveAt(index);
view.Nodes.Insert(index - 1, node);
node.Text = node.Text;
}
}
}

/// <summary>
/// Move Selected Node Down in TreeNode Collection
/// </summary>
/// <param name="node"></param>
public static void MoveDown(this TreeNode node)
{
TreeNode parent = node.Parent;
TreeView view = node.TreeView;

if (parent != null)
{
int index = parent.Nodes.IndexOf(node);
if (index < parent.Nodes.Count - 1)
{
parent.Nodes.RemoveAt(index);
parent.Nodes.Insert(index + 1, node);
node.Text = node.Text;
}
}
else if (view != null && view.Nodes.Contains(node)) //root node
{
int index = view.Nodes.IndexOf(node);
if (index < view.Nodes.Count - 1)
{
view.Nodes.RemoveAt(index);
view.Nodes.Insert(index + 1, node);
node.Text = node.Text;
}
}
}

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