TreeView image of a node disappears

Hello
I wrote this code. It is good. My solution is correct?
private void MaintreeView_AfterSelect(object sender, TreeViewEventArgs e)
TreeNode tn = MaintreeView.SelectedNode;
if (tn.Level == 7)
if (tn.Tag.ToString() == "x")
tn.Text = richTextBox_MS.Text;
else if (tn.Tag.ToString() == "y")
tn.Text = richTextBox_MP.Text;
else if (tn.Tag.ToString() == "z")
tn.Text = richTextBox_BK.Text;
private void MaintreeView_BeforeSelect(object sender, TreeViewCancelEventArgs e)
TreeNode tn = MaintreeView.SelectedNode;
if (tn != null)
if (tn.Level == 7)
if (tn.Tag.ToString() == "x")
if (richTextBox_MS.Text.Contains("x"))
tn.Text = richTextBox_MS.Text;
else
tn.Text = GetQuotedName(tn.Tag.ToString()) + richTextBox_MS.Text;
else if (tn.Tag.ToString() == "y")
if (richTextBox_MP.Text.Contains("y"))
tn.Text = richTextBox_MP.Text;
else
tn.Text = GetQuotedName(tn.Tag.ToString()) + richTextBox_MP.Text;
else if (tn.Tag.ToString() == "z")
if (richTextBox_BK.Text.Contains("z"))
tn.Text = richTextBox_BK.Text;
else
tn.Text = GetQuotedName(tn.Tag.ToString()) + richTextBox_BK.Text;

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