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protected void Button1_Click(object sender, EventArgs e)
{
//download
StreamReader sr = File.OpenText(Server.MapPath("test.txt"));
string content = sr.ReadToEnd();
Response.Buffer = true;
Response.Clear();
Response.ContentType = "txt";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode("test.txt"));
System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding();
byte[] file = System.Text.Encoding.Default.GetBytes(content);
Response.BinaryWrite(file);
Response.Flush();
Response.End();
}