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using System.Data;     using System.Data.OleDb;     using System.IO;     using System.Text; protected void Page_Load(object sender, EventArgs e)      {                }      public void ExcelToDS(string path)         {              string strSheetName = "sheet1";             string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +path + ";Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'";             //Sql语句              string strExcel = "select * from  [" + strSheetName + "$] ";                       DataSet ds = new DataSet();            //连接数据源              OleDbConnection conn = new OleDbConnection(strConn);              conn.Open();                 //适配到数据源              OleDbDataAdapter adapter = new OleDbDataAdapter(strExcel, conn);             adapter.Fill(ds, "data");                 conn.Close();                 GridView1.DataSource = ds.Tables["data"];             GridView1.DataBind();               Label1.Text = ds.Tables[0].Rows.Count.ToString();             SqlAccess.Sqldatabase sql = new SqlAccess.Sqldatabase();             StringBuilder sb = new StringBuilder();             for (int i = 0; i < ds.Tables[0].Rows.Count; i++)             {                     sb.Append("insert into data values('" + ds.Tables[0].Rows[i]["companyname"] + "','" + ds.Tables[0].Rows[i]["telname"] + "','" + ds.Tables[0].Rows[i]["qytel"] + "','" + ds.Tables[0].Rows[i]["fax"] + "');");                }             sql.ExecuteNonQuery(CommandType.Text, sb.ToString());             }         protected void Button1_Click(object sender, EventArgs e)         {             string fileName = null;             try            {                 Boolean fileOK = false;                 String path = Server.MapPath("./doc/");                 if (FileUpload2.HasFile)                 {                     String fileExtension =                         System.IO.Path.GetExtension(FileUpload2.FileName).ToLower();                     String[] allowedExtensions =                      { ".xls" };     //C#读取Excel中数据                for (int i = 0; i < allowedExtensions.Length; i++)                     {                         if (fileExtension == allowedExtensions[i])                         {                             fileOK = true;                         }                     }                 }                     if (fileOK)                 {                    fileName = "r_" + DateTime.Now.ToString("yyyy_MM_dd_hh_mm_ss") + "_" + DateTime.Now.Millisecond +                         System.IO.Path.GetExtension(FileUpload2.FileName).ToLower();                     if (File.Exists(path + fileName))                     {                         Random rnd = new Random(10000);                         fileName = fileName + rnd.Next();                     }                         FileUpload2.PostedFile.SaveAs(path                         + fileName);                                        }                 else                {                                      }             }             catch (Exception exp)             {             }             ExcelToDS(Server.MapPath(".") + "\\doc\\"+fileName);             }   

1.EXCEL可以做为数据源，自然可以读到datagridview中            string strCon = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= " + newfilename + ";Extended Properties=Excel 8.0;";
            OleDbConnection myConn = new OleDbConnection(strCon);
            string strCom = " SELECT * FROM [prd$] ";            myConn.Open();            OleDbCommand myCommand = new OleDbCommand(strCom, myConn);
            OleDbDataReader ddr = myCommand.ExecuteReader();
2.从数据库读入程序就不说了，比如存在一个list里，写入EXCEL很简单                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application(); //开启excel
                excel.Application.Workbooks.Add(true);
                Microsoft.Office.Interop.Excel.Sheets ExcelSheets = excel.Worksheets; //建立一个新的工作表
                excel.Cells[1, 1] = "文件";
                excel.Cells[1, 2] = "代号";
                excel.Cells[1, 3] = "公司";
                if (list != null)
                {
                    for (int i = 0; i < list.Count; i++)
                    {
                        excel.Cells[i + 1, 1] = "'" + list[i].FileType;
                        excel.Cells[i + 1, 2] = "'" + list[i].Fileid;
                        excel.Cells[i + 1, 3] = "'" + list[i].Cardcom;
                    }
                }                excel.Workbooks.Close();
                excel.Quit();//关闭excel程序
                return true;

excel导入dataset
string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";
 using(OleDbConnection OleConn = new OleDbConnection(strConn))
{
  OleConn.Open();
  String sql = "SELECT * FROM [Sheet1$]";
  OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);
  DataSet ds= new DataSet();
  OleDaExcel.Fill(ds);
  OleConn.Close();
}打开EXCEL模板赋值给单元格

如果EXCEL有单元格合并之类的，怎么体现到datagridview中