Asp.Net 导入Excel表格

前台页面：

<div align="center" style="background-color:Beige">
<table style="width: 576px; border-collapse: separate; text-align: center">
<tr><td>Excel导入SQL数据库</td></tr>
<tr>
<td style="text-align: left">
<asp:FileUpload ID="FileUpload1" runat="server" Width="305px" />
<asp:Button ID="btnToLead" runat="server" OnClick="Button1_Click" Text="导入SQL" /></td>
</tr>
<tr>
<td>
<asp:GridView ID="gvExcelEdu" runat="server" Height="64px" Width="100%" AutoGenerateColumns="False">
<Columns>
<asp:BoundField DataField="Id" HeaderText="编号" />
<asp:BoundField DataField="userName" HeaderText="用户名" />
<asp:BoundField DataField="passWord" HeaderText="密码" />
</Columns>
</asp:GridView>
</td>
</tr>
</table>
</div>

后台代码：
注意添加引用

using System.Data.OleDb;
using System.Data.SqlClient;
string strConn = "Data Source=192.168.0.8;DataBase=BR_BMS;Uid=DP;Pwd=dp"; //链接SQL数据库

    //加载事件
    protected void Page_Load(object sender, EventArgs e)
    {
        SqlConnection cn = new SqlConnection(strConn);
        cn.Open();
        SqlDataAdapter sda = new SqlDataAdapter("select * from Emp_Admin", cn);
        DataSet ds = new DataSet();
        sda.Fill(ds, "Admin");
        this.gvExcelEdu.DataSource = ds.Tables["Admin"];
        this.gvExcelEdu.DataKeyNames = new string[] { "id" };
        this.gvExcelEdu.DataBind();
    }
// 查询EXCEL电子表格添加到DATASET
public DataSet ExecleDs(string filenameurl, string table)
{
string strConn = "Provider=Microsoft.Jet.OleDb.4.0;" + "data source=" + filenameurl + ";Extended Properties='Excel 8.0; HDR=YES; IMEX=1'";
OleDbConnection conn = new OleDbConnection(strConn);
conn.Open();
DataSet ds = new DataSet();
OleDbDataAdapter odda = new OleDbDataAdapter("select * from [Sheet1$]", conn);
odda.Fill(ds, table);
return ds;
 }
// Excel导入数据
protected void Button1_Click(object sender, EventArgs e)
{
 if (FileUpload1.HasFile == false)//HasFile用来检查FileUpload是否有指定文件
{
   Response.Write("<script>alert('请您选择Excel文件')</script> ");
    return;//当无文件时,返回
 }
string IsXls = System.IO.Path.GetExtension(FileUpload1.FileName).ToString().ToLower();//System.IO.Path.GetExtension获得文件的扩展名
if (IsXls != ".xls")
{
   Response.Write("<script>alert('只可以选择Excel文件')</script>");
    return;//当选择的不是Excel文件时,返回
        }
SqlConnection cn = new SqlConnection(strConn);
cn.Open();
string filename = DateTime.Now.ToString("yyyymmddhhMMss") + FileUpload1.FileName;              //获取Execle文件名  DateTime日期函数
string savePath = Server.MapPath(("~\\upfiles\\") + filename);//Server.MapPath 获得虚拟服务器相对路径
FileUpload1.SaveAs(savePath);                        //SaveAs 将上传的文件内容保存在服务器上
DataSet ds = ExecleDs(savePath, filename);           //调用自定义方法
DataRow[] dr = ds.Tables[0].Select();            //定义一个DataRow数组
int rowsnum = ds.Tables[0].Rows.Count;
if (rowsnum == 0)
{
    Response.Write("<script>alert('Excel表为空表,无数据!')</script>");   //当Excel表为空时,对用户进行提示
}
else
{
     for (int i = 0; i < dr.Length; i++)
{
string id = dr[i]["编号"].ToString();//编号 列名 以下类似
string userName = dr[i]["用户名"].ToString();
string passWord = dr[i]["密码"].ToString();//密码 excel列名【名称不能变,否则就会出错】
string sqlcheck = "select count(*) from Emp_Admin where userName='" + userName + "'And passWord='" + passWord + "'";  //检查用户是否存在
SqlCommand sqlcmd = new SqlCommand(sqlcheck, cn);
int count = Convert.ToInt32(sqlcmd.ExecuteScalar());
if (count < 1)
{
    string insertstr = "insert into Emp_Admin (userName,passWord) values('" + userName + "','" + passWord + "')";
    SqlCommand cmd = new SqlCommand(insertstr, cn);
try
{
    cmd.ExecuteNonQuery();
}
catch (MembershipCreateUserException ex)       //捕捉异常
{
      Response.Write("<script>alert('导入内容:" + ex.Message + "')</script>");
}
}
else
 {
       Response.Write("<script>alert('内容重复！禁止导入');location='default.aspx'</script></script> ");
       continue;
}
}
       Response.Write("<script>alert('Excle表导入成功!');location='default.aspx'</script>");
}
        cn.Close();
}