Help Putting Contents of XML file into C# textbox?

You can go with searializing,
I prefer go with binary searialization

Stream stream = File.Open("YourFileWithAnYExtension", FileMode.Create);

BinaryFormatter bformatter = new BinaryFormatter();

Console.WriteLine("Writing Employee Information");

bformatter.Serialize(stream, Textbox.Text);

stream.Close();

mp = null;

stream = File.Open("YourFileWithAnYExtension", FileMode.Open);

bformatter = new BinaryFormatter();

Console.WriteLine("Reading Employee Information");

Textbox.Text = (string)bformatter.Deserialize(stream);

stream.Close();

Check this is corerct answer if it helped