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private void button1_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("d:\\test.txt", FileMode.Open,FileAccess.Read);
StreamReader sr = new StreamReader(fs);
while (sr.ReadLine() != null)
{
textBox1.Text += sr.ReadLine();
}
}

string s="";
while (s=sr.ReadLine() != null)
{
textBox1.Text += s;
}