gridview的高级使用

后台数据
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;
using System.Text;
using System.IO;

namespace WebApplication2
{
    public partial class WebForm6 : System.Web.UI.Page
    {
        SqlConnection sqlcon;
        string strCon = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Integrated Security=True;User Instance=True";
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                bind();
            }
        }
        protected void CheckBox2_CheckedChanged(object sender, EventArgs e)
        {
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
                if (CheckBox2.Checked == true)
                {
                    cbox.Checked = true;
                }
                else
                {
                    cbox.Checked = false;
                }
            }
        }
        protected void Button2_Click(object sender, EventArgs e)
        {
            sqlcon = new SqlConnection(strCon);
            SqlCommand sqlcom;
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
                if (cbox.Checked == true)
                {

                    string sqlstr = "delete from tb_sql where sname='" + GridView1.DataKeys[i].Value + "'";
                    sqlcom = new SqlCommand(sqlstr, sqlcon);
                    sqlcon.Open();
                    sqlcom.ExecuteNonQuery().ToString();
                    sqlcon.Close();
                }
            }
            bind();
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            CheckBox2.Checked = false;
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
                cbox.Checked = false;
            }
        }
        public void bind()
        {
            string sqlstr = "select top 5 * from tb_sql";
            sqlcon = new SqlConnection(strCon);
            SqlDataAdapter myda = new SqlDataAdapter(sqlstr, sqlcon);
            DataSet myds = new DataSet();
            sqlcon.Open();
            myda.Fill(myds, "tb_sql");
            GridView1.DataSource = myds;
            GridView1.DataKeyNames = new string[] { "sname" };
            GridView1.DataBind();
            for (int i = 0; i <= GridView1.Rows.Count - 1; i++)
            {
                DataRowView mydrv = myds.Tables["tb_sql"].DefaultView[i];
                string score = Convert.ToString(mydrv["sid"]);
                if (Convert.ToDouble(score) < 5)//大家这里根据具体情况设置可能ToInt32等等
                {
                    GridView1.Rows[i].Cells[4].BackColor = System.Drawing.Color.Red;
                }
            }
            //sqlcon.Close();

            sqlcon.Close();
        }

        protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            int i;
            //执行循环，保证每条数据都可以更新
            for (i = 0; i < GridView1.Rows.Count; i++)
            {
                //首先判断是否是数据行
                if (e.Row.RowType == DataControlRowType.DataRow)
                {
                    //当鼠标停留时更改背景色
                    e.Row.Attributes.Add("onmouseover", "c=this.style.backgroundColor;this.style.backgroundColor='#00A9FF'");
                    //当鼠标移开时还原背景色
                    e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor=c");
                }
            }

            //如果是绑定数据行
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                if (e.Row.RowState == DataControlRowState.Normal || e.Row.RowState == DataControlRowState.Alternate)
                {

                    //CheckBox cbox = (CheckBox)GridView1.Rows[i].FindControl("CheckBox1");
                    ((LinkButton)e.Row.Cells[6].Controls[0]).Attributes.Add("onclick", "javascript:return confirm('你确认要删除用户名：\"" + e.Row.Cells[2].Text + "\"吗?')");
                }
            }
            if (e.Row.RowIndex != -1)
            {
                int id = e.Row.RowIndex + 1;
                e.Row.Cells[0].Text = id.ToString();
            }

        }

        protected void Button3_Click(object sender, EventArgs e)
        {
            Export("application/ms-excel", "学生成绩报表.xls");

        }
        private void Export(string FileType, string FileName)
        {
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF7;
            Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
            Response.ContentType = FileType;
            this.EnableViewState = false;
            StringWriter tw = new StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);

            GridView1.RenderControl(hw);

            Response.Write(tw.ToString());
            Response.End();
        }
        public override void VerifyRenderingInServerForm(Control control)
        {
        }

    }

}