大体代码如下,相关地方敬请自行修改：

//SqlDataAdapter mycmd = new SqlDataAdapter(sqlcmd,mycon);
    DataSet ds = new DataSet();
    mycmd.Fill(ds,"mytable");
    StringWriter sw=new StringWriter();
    sw.WriteLine("姓名\t班级\t学号\t学科\t成绩\t阶段\t日期\tＩＤ");
    foreach(DataRow dr in ds.Tables["mytable"].Rows)
    {  
     sw.WriteLine(dr[0].ToString()+"\t"+dr[1].ToString()+"\t"+dr[2].ToString()+"\t"+dr[3].ToString()+"\t"+dr[4].ToString()+"\t"+dr[5].ToString()+"\t"+dr[6].ToString()+"\t"+dr[7].ToString()+"\t");
    }
    sw.Close();
    Response.AddHeader("Content-Disposition", "attachment; filename=MyWord.doc");
    Response.ContentType = "application/ms-excel";
    Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
    Response.Write(sw);
    Response.End();