SaveFileDialog

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Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace _0060 {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
richTextBox1.Select();
}
private void button1_Click(object sender, EventArgs e) {
saveFileDialog1.Filter = "Text (*.txt) | *.txt";
if(saveFileDialog1.ShowDialog() == DialogResult.OK) {
richTextBox1.SaveFile(saveFileDialog1.FileName, RichTextBoxStreamType.PlainText);
}
textBox1.Visible = true;
textBox1.Text = saveFileDialog1.FileName;
}
private void button2_Click(object sender, EventArgs e) {
richTextBox1.Clear();
textBox1.Clear();
textBox1.Visible = false;
}
}
}

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