[Solved] How do I store values from textbox in C#

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This is just a simple working example based on the code you provided, but probably there are better ways to accomplish what you are trying to do:

private void button1_Click(object sender, EventArgs e)
{
    string name = this.txtName.Text;
    string occupation = this.txtOccupation.Text;
    string dob = this.txtDob.Text;
    string nic = this.txtNic.Text;
    double id = double.Parse(this.lblID.Text);

    // XML file path.
    string xmlPath = "E:/Data.xml";

    XmlDocument xmlDoc = new XmlDocument();

    // If specified file does not exist, create a new one.
    if (!File.Exists(xmlPath))
    {
        XmlDeclaration xmlDeclaration = xmlDoc.CreateXmlDeclaration("1.0", "UTF-8", "yes");
        XmlElement rootNode = xmlDoc.DocumentElement;
        xmlDoc.InsertAfter(xmlDeclaration, rootNode);

        XmlNode parentNode = xmlDoc.CreateElement("Users");
        XmlNode subNode = xmlDoc.CreateElement("User");

        XmlAttribute nameAtt = xmlDoc.CreateAttribute("Name");
        nameAtt.Value = name;
        XmlAttribute occupationAtt = xmlDoc.CreateAttribute("Occupation");
        occupationAtt.Value = occupation;
        XmlAttribute dobAtt = xmlDoc.CreateAttribute("Date_Of_Birth");
        dobAtt.Value = dob;
        XmlAttribute nicAtt = xmlDoc.CreateAttribute("NIC");
        nicAtt.Value = nic;
        XmlAttribute idAtt = xmlDoc.CreateAttribute("ID");
        idAtt.Value = id.ToString();

        subNode.Attributes.Append(nameAtt);
        subNode.Attributes.Append(occupationAtt);
        subNode.Attributes.Append(dobAtt);
        subNode.Attributes.Append(nicAtt);
        subNode.Attributes.Append(idAtt);

        xmlDoc.AppendChild(parentNode);
        parentNode.AppendChild(subNode);

        // Save new XML file.
        xmlDoc.Save(xmlPath);
    }
    // If specified file exists, read and update it.
    else
    {
        // Open existing XML file.
        xmlDoc.Load(xmlPath);

        // Set to true if current name is already found in the XML file,
        // of course it should be better to check the ID instead the name,
        // supposing that ID is unique.
        bool nameFound = false;

        // Get all "User" nodes and check if one of them already contains
        // the specified name.
        foreach (XmlNode user in xmlDoc.SelectNodes("Users/User"))
        {
            if (user.Attributes.GetNamedItem("Name").Value == name)
            {
                nameFound = true;
                break;
            }
        }

        // If the name is not already in the file, insert a new user
        // with that name.
        if (nameFound == false)
        {
            XmlNode subNode = xmlDoc.CreateElement("User");

            XmlAttribute nameAtt = xmlDoc.CreateAttribute("Name");
            nameAtt.Value = name;
            XmlAttribute occupationAtt = xmlDoc.CreateAttribute("Occupation");
            occupationAtt.Value = occupation;
            XmlAttribute dobAtt = xmlDoc.CreateAttribute("Date_Of_Birth");
            dobAtt.Value = dob;
            XmlAttribute nicAtt = xmlDoc.CreateAttribute("NIC");
            nicAtt.Value = nic;
            XmlAttribute idAtt = xmlDoc.CreateAttribute("ID");
            idAtt.Value = id.ToString();

            subNode.Attributes.Append(nameAtt);
            subNode.Attributes.Append(occupationAtt);
            subNode.Attributes.Append(dobAtt);
            subNode.Attributes.Append(nicAtt);
            subNode.Attributes.Append(idAtt);

            xmlDoc.SelectSingleNode("Users").AppendChild(subNode);

            xmlDoc.Save(xmlPath);
        }
    }
}

And this is a sample output XML file:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Users>
  <User Name="John" Occupation="student" Date_Of_Birth="1990" NIC="NIC" ID="123" />
  <User Name="David" Occupation="professor" Date_Of_Birth="1973" NIC="NIC" ID="452" />
</Users>

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solved How do I store values from textbox in C#