Clash Royale CLAN TAG

A c# program that searches through multiple XML files and text to certain elements inside

I need to create a c# program that searches through multiple XML files and adds a post fix entered by the user to certain elements inside those XML files, those elements all have the string "_name" inside them, which is a blessing considering now I know what extra condition I can use to make sure I'm altering the correct elements, My basic understanding of how the process is gonna go is like this:

1- I let user browse through his computer and open the folder in which the XML files exist.
2- I let the program add "main" to the chosen path and so open the main.xml file which contains all the files I'll be needing to alter. (done)
3- create a loop that will open each file inside the main.xml file and store all its' contents inside a list of strings.
4- now compare each element inside the list with the content of each folder, and if a match is found, i make sure the name tags contain "%_Name" in them before making a change. since for example " bla bla May exist in more than one file and I'll be needing to change all of them.

Correct me if I'm wrong or if there's a better solution than this.

Here's the code I've written so far.

//The browse button.

private void button1_Click(object sender, EventArgs e) {
string folderPath = "";
FolderBrowserDialog folderBrowserDialog1 = new FolderBrowserDialog();
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) {
folderPath = folderBrowserDialog1.SelectedPath;
textBox1.Text = folderPath;
}


// the add text button click will open the main.xml and get all the names of other files inside from it. That's what I've written so far.

private void button2_Click(object sender, EventArgs e) {
if (textBox1.Text == null)
MessageBox.Show("Please choose a folder");
else {
string postfix = textBox2.Text;
if ((postfix.Length > 0) && (postfix.Length < 2)) {

// Load the document.
String folderPath = textBox1.Text;
XmlDocument doc = new XmlDocument();
doc.Load(folderPath + "\Main.xml");
int i = 0;
XmlNode root = doc.FirstChild.NextSibling;
XmlNodeList tree = root.ChildNodes;
List<string>mainList = new List<string>();
XmlReader reader = null;

foreach (XmlNode node in tree) {
string url = tree.Item(i).InnerText;
mainList.Add(tree.Item(i).InnerText);
string name = mainList[i];
reader = XmlReader.Create(url);

while (reader.Read()) {
if ((reader.NodeType == XmlNodeType.Element) && reader.Name == name) { }
}
i++;
}
}
else {
MessageBox.Show("Please enter atleast 1 character or 2 at maximum for the postfix.");
}
}
}


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