private void button1_Click(object sender, EventArgs e) { OpenFileDialog op=new OpenFileDialog(); op.Filter="Text files|*.txt"; DialogResult dr = op.ShowDialog(); StreamReader sr = new StreamReader(op.FileName ); richTextBox1.Text = sr.ReadToEnd(); sr.Close(); } private void button2_Click(object sender, EventArgs e) { StreamWriter sr = new StreamWriter( here i dont know ??? ); sr.WriteLine(richTextBox1.Text); sr.Close(); }
var
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