Net based on girdview control to delete and edit row data

The code is as follows ：

using System;

using System.Collections.Generic;

using System.Data;

using System.Data.SqlClient;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class Modifying data : System.Web.UI.Page

{

   protected void Page_Load(object sender, EventArgs e)

   {

       // If the page is loaded in response to a client postback , Then for true; Otherwise false.

       if (!this.IsPostBack)

       {

           this.Bind();

       }

     

   }

   /// <summary>

   /// Bind data source data to gridview Control

   /// </summary>

   private void Bind()

   {

       SqlConnection con = help.con();

       con.Open();

       string str = "select * from cs";

       SqlCommand cmd = new SqlCommand(str,con);

       SqlDataAdapter da = new SqlDataAdapter(cmd);

       DataSet ds = new DataSet();

       da.Fill(ds);

       this.GridView1.DataSource = ds;

       this.GridView1.DataKeyNames = new string[] { "id"};

       this.GridView1.DataBind();

       da.Dispose();

       cmd.Dispose();

       con.Close();

   }

   /// <summary>

   /// The row edit event assigns a value to the edit row index

   /// </summary>

   /// <param name="sender"></param>

   /// <param name="e"></param>

   protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)

   {

      this.GridView1.EditIndex= e.NewEditIndex;

       this.Bind();

   }

   /// <summary>

   /// Before line update

   /// </summary>

   /// <param name="sender"></param>

   /// <param name="e"></param>

   protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)

   {

      string id= this.GridView1.DataKeys[e.RowIndex].Value.ToString();

     string cate= ((TextBox)(this.GridView1.Rows[e.RowIndex].Cells[2]).Controls[0]).Text.ToString();

       SqlConnection conn = help.con();

       conn.Open();

       string str = "update cs set Fcate='"+cate+"' where id="+id+"";

       SqlCommand cmd = new SqlCommand(str, conn);

       cmd.ExecuteNonQuery();

       cmd.Dispose();

       conn.Close();

       this.GridView1.EditIndex = -1;

       this.Bind();

   }

   /// <summary>

   /// Triggered when the line is canceled

   /// </summary>

   /// <param name="sender"></param>

   /// <param name="e"></param>

   protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)

   {

       this.GridView1.EditIndex = -1;// Does not point to any line

       this.Bind();

   }

   /// <summary>

   /// What to do before deleting a row

   /// </summary>

   /// <param name="sender"></param>

   /// <param name="e"></param>

   protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)

   {

         string id=  this.GridView1.DataKeys[e.RowIndex].Value.ToString();

       SqlConnection conn = help.con();

       conn.Open();

       SqlCommand cmd = new SqlCommand();

       cmd.CommandText = "delete from cs where id="+id+"";

       cmd.Connection = conn;

       cmd.ExecuteNonQuery();

       cmd.Dispose();

       conn.Close();

       this.GridView1.EditIndex = -1;

       this.Bind();

   }

   /// <summary>

   /// Add script events to the delete button when binding data controls

   /// </summary>

   /// <param name="sender"></param>

   /// <param name="e"></param>

   protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

   {

       if(e.Row.RowType == DataControlRowType.DataRow)

       {

           // Get the second child of the first cell

           if (((LinkButton)e.Row.Cells[0].Controls[2]).Text == " Delete ") {

               ((LinkButton)e.Row.Cells[0].Controls[2]).Attributes.Add("onclick", "return confirm(' Are you sure you want to delete ？')");

           }

       }

   }

}

Partial screenshots ：