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string filePath="";
ScriptManager.RegisterStartupScript(this, this.GetType(), "RegisterStartupScript"
, String.Format("window.navigate('DownloadFile.aspx?Filename={0}');", Server.UrlEncode(filePath)), true);


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string  Filename= Server.MapPath("../path/") +Request.QueryString["Filename"].ToString() ;
Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName.Substring(FileName.LastIndexOf('/') + 1), System.Text.Encoding.GetEncoding("utf-8")));
Response.ContentType = "application/octet-stream";
Response.WriteFile("" + dir.Trim() + FileName+"");
Response.End();


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