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    protected void Button1_Click(object sender, EventArgs e)
    {
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        Response.TransmitFile(filename);
    }
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    protected void Button2_Click(object sender, EventArgs e)
    {
        /*
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        string fileName = "asd.txt";//¿Í»§¶Ë±£´æµÄÎļþÃû
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        FileInfo fileInfo = new FileInfo(filePath);
        Response.Clear();
        Response.ClearContent();
        Response.ClearHeaders();
        Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
     


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