GridView 批量修改

    <div>
  <asp:GridView ID="GridView1" runat="server" Font-Size="12px" CellPadding="3" AutoGenerateColumns="False"
    DataKeyNames="employeeid"  >
    <HeaderStyle BackColor="#EDEDED" />
    <Columns>
     
       <asp:TemplateField HeaderText="编号">
       <ItemTemplate>
       <asp:TextBox ID="employeeid" runat="server" Text='<%#Eval("employeeid") %>'  ></asp:TextBox>
       </ItemTemplate></asp:TemplateField>
      <asp:TemplateField HeaderText="姓">
        <ItemTemplate>
          <asp:TextBox ID="lastname" runat="server" Text='<%#Eval("lastname") %>'></asp:TextBox>
        </ItemTemplate>
      </asp:TemplateField>
      <asp:TemplateField HeaderText="名">
        <ItemTemplate>
          <asp:TextBox ID="firstname" runat="server" Text='<%#Eval("firstname") %>'></asp:TextBox>
        </ItemTemplate>
      </asp:TemplateField>
        
    </Columns>
  </asp:GridView>
  <asp:Button ID="Button1" runat="server" Text="保存所有修改" OnClick="Button1_Click"  />
    </div>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;

public partial class txt_uoALLdate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //绑定GRIDVIEW打开页面显示数据
            GridViewbind();
        }

    }
    private void GridViewbind()
    {
        //连接字符串WEB.CONFIG里面的
        string conn = System.Configuration.ConfigurationManager.ConnectionStrings["SQLCONNECTIONSTRING"].ConnectionString;
        SqlConnection con = new SqlConnection(conn);
        SqlCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "select * from employees";
        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds, "employee");
        this.GridView1.DataSource = ds.Tables["employee"];
        GridView1.DataBind();
    }

    protected void Button1_Click(object sender, EventArgs e)
    {

        foreach (GridViewRow gvr in GridView1.Rows)
        {
            string con = System.Configuration.ConfigurationManager.ConnectionStrings["SQLCONNECTIONSTRING"].ConnectionString;

            SqlConnection conn = new SqlConnection(con);
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandType = CommandType.Text;
            cmd.CommandText = "update employees set lastname=@lastname,firstname=@firstname where employeeid=@employeeid";

            cmd.Parameters.Add("@lastname", SqlDbType.NVarChar, 20);
            cmd.Parameters.Add("@firstname", SqlDbType.NVarChar, 10);
            cmd.Parameters.Add("@employeeid", SqlDbType.Int);

            cmd.Parameters["@lastname"].Value = ((TextBox)gvr.FindControl("lastname")).Text;
            cmd.Parameters["@firstname"].Value = ((TextBox)gvr.FindControl("firstname")).Text;
            cmd.Parameters["@employeeid"].Value = ((TextBox)gvr.FindControl("employeeid")).Text;
            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
            }
            finally
            {
                if (conn != null)
                    conn.Dispose();
            }

        }
    }
}