Hide Node in Treeview List. in C#

I am using VS 2005 C#, working on an unfinished WinForm.

I have parsed an XML to a treeview listing but I'm encountering some problems. I wanna know if there's a way to hide/filter/remove a certain node containing a "_this_text" in its name without having to depend on a textbox.

This is what I have for the program (kudos to those who helped me develop this):

#region "***** XML Parsing *****"
    private void Form1_Load_1(object sender, EventArgs e)
    {
        // Initialize the controls and the form.
        //label1.Text = "File Path";
        textBox2.Text = Application.StartupPath + "\\Continental.vsysvar";
        //button6.Text = "XML";
        //this.Text = "Software Validation";
    }

    private TreeNode selectedNode = null;

    private void button6_Click(object sender, EventArgs e)
    {
        try
        {
            // SECTION 1. Create a DOM Document and load the XML data into it.
            XmlDocument dom = new XmlDocument();
            dom.Load(textBox2.Text);

            // SECTION 2. Initialize the TreeView control.
            treeView1.Nodes.Clear();
            /*treeView1.Nodes.Add(new TreeNode(dom.DocumentElement.Name));
            TreeNode tNode = new TreeNode();
            tNode = treeView1.Nodes[0];*/

            foreach (XmlNode node in dom.DocumentElement.ChildNodes)
            {
                if (node.Name == "namespace" && node.ChildNodes.Count == 0 && string.IsNullOrEmpty(GetAttributeText(node, "name")))
                    continue;
                AddNode(treeView1.Nodes, node);
            }

            treeView1.ExpandAll();
        }
        /* catch (XmlException xmlEx)
         {
             MessageBox.Show(xmlEx.Message);
         }*/
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private void LoadTreeFromXmlDocument(XmlDocument dom)
    {
        try
        {
            // SECTION 2. Initialize the TreeView control.
            treeView1.Nodes.Clear();

            // SECTION 3. Populate the TreeView with the DOM nodes.
            foreach (XmlNode node in dom.DocumentElement.ChildNodes)
            {
                if (node.Name == "namespace" && node.ChildNodes.Count == 0 && string.IsNullOrEmpty(GetAttributeText(node, "name")))
                    continue;
                AddNode(treeView1.Nodes, node);
            }

            treeView1.ExpandAll();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    static string GetAttributeText(XmlNode inXmlNode, string name)
    {
        XmlAttribute attr = (inXmlNode.Attributes == null ? null : inXmlNode.Attributes[name]);
        return attr == null ? null : attr.Value;
    }

    private void AddNode(TreeNodeCollection nodes, XmlNode inXmlNode)
    {
        if (inXmlNode.HasChildNodes)
        {
            string text = GetAttributeText(inXmlNode, "name");
            if (string.IsNullOrEmpty(text))
                text = inXmlNode.Name;
            TreeNode newNode = nodes.Add(text);
            XmlNodeList nodeList = inXmlNode.ChildNodes;
            for (int i = 0; i <= nodeList.Count - 1; i++)
            {
                XmlNode xNode = inXmlNode.ChildNodes[i];
                AddNode(newNode.Nodes, xNode);
            }
        }
        else
        {
            // If the node has an attribute "name", use that.  Otherwise display the entire text of the node.
            string text = GetAttributeText(inXmlNode, "name");
            if (string.IsNullOrEmpty(text))
                text = (inXmlNode.OuterXml).Trim();
            TreeNode newNode = nodes.Add(text);
        }
    }
    #endregion

And here's an excerpt of the XMl file since it's quite long:

    <?xml version="1.0" encoding="utf-8"?>
<systemvariables version="4">
  <namespace name="" comment="">
    <namespace name="_01_Test_Preparation" comment="">
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_02_Shipping_Status_Check" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_02_Shipping_Status_Check_start" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_01_Get_Dem_ID" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_01_Get_Dem_ID_start" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_04_ECU_Version_Check_start" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_03_Test_Run_Init" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_04_ECU_Version_Check" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_05_DEM_Reader" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_03_Test_Run_Init_start" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
      <variable anlyzLocal="2" readOnly="false" valueSequence="false" unit="" name="_01_05_DEM_Reader_start" comment="" bitcount="32" isSigned="true" encoding="65001" type="int" startValue="0" minValue="0" minValuePhys="0" maxValue="4" maxValuePhys="4" />
    </namespace>

What I really want to accomplish is to hide or filter the nodes containing this text "_start" found in their name. So all nodes containing "_this_start" in their name would be hidden from the user. I've read that it is not technically possible to enable or disable visibility but instead gray out the text and whatnot.

Thank you in advance.