Gridview中的选择、删除、编辑、更新、取消留着备用。

后台程序：

public partial class tw2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            this.createdb();
        }
    }
    private void createdb()
    {
        SqlConnection cn = new SqlConnection("server=.;database=zhang;uid=sa;pwd=410"); //(Data Source =服务器;Initial Catalog=数据库;Integrated Security=True")本地用户登录
        SqlDataAdapter adp = new SqlDataAdapter();
        adp.SelectCommand = new SqlCommand("select * from chang", cn);
        DataSet ds = new DataSet();
        adp.Fill(ds, "chang");
        this.GridView1.DataKeyNames = new string[] { "changid" }; //定义主键
        this.GridView1.DataSource = ds.Tables[0].DefaultView;
        this.GridView1.DataBind();
        cn.Close();    }
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) //取消按钮
    {
        GridView1.EditIndex = -1;
        this.createdb();
    }
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e) //编辑按钮
    {
        GridView1.EditIndex = e.NewEditIndex;
        this.createdb();
    }
    protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e) //选择按钮
    {
       int id = Convert.ToInt32(e.CommandArgument); //取行索引号
       string txt = GridView1.DataKeys[id].Value.ToString();　//取主键的值
       Response.Write(txt);
       // this.createdb();    }
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e) //删除按钮
    {

　　//在删除事件中获取绑定列的值 GridView1.Rows[e.RowIndex].Cells[1].Text.ToString();
        SqlConnection cn = new SqlConnection("server=.;database=zhang;uid=sa;pwd=410");
        cn.Open();
        SqlCommand cm=new SqlCommand("delete from chang where changid=" +GridView1.DataKeys[e.RowIndex].Value,cn); //e.RowIndex取本行索引号，
        cm.ExecuteNonQuery();
        cn.Close();
        GridView1.EditIndex = -1;
        this.createdb();    }
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e) //更新按钮
    {
        GridViewRow   row   =   GridView1.Rows[e.RowIndex]; 
        TextBox   box   =   (TextBox)row.Cells[2].Controls[0];
        Response.Write(box.Text);
        try
        {
            SqlConnection cn = new SqlConnection("server=.;database=zhang;uid=sa;pwd=410");
            cn.Open();
            SqlCommand cm = new SqlCommand("update chang set chang1='" + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[2].Controls[0])).Text.ToString().Trim() + "',chang2='" + ((TextBox)(GridView1.Rows[e.RowIndex].Cells[3].Controls[0])).Text.ToString().Trim() + "' where changid=" + GridView1.DataKeys[e.RowIndex].Value, cn); //列的编号是从1,这里更新的是第二列和第三列所以cell[2],cell[3],而行的索引是从0开始的
            cm.ExecuteNonQuery();
            GridView1.EditIndex = -1;
            this.createdb();
            cn.Close();

　　　　//在更新事件中获取其他绑定列的值

　　　//　GridView1.Rows[e.RowIndex].Cells[9].Text.ToString();

　　　　//由于隐藏列不能获取其值，可以用以下方法：

　　　　//1.先定义个隐藏样式

　　　　　　<style type="text/css">
   .hidden { display:none;}
</style>

　　　　　　2.在隐藏列的HTML标记里引用这个样式，代码如下：

<asp:BoundField DataField="num"  ReadOnly="True">
                    <HeaderStyle CssClass="hidden" />
                    <ItemStyle CssClass="hidden" />
                    </asp:BoundField>

　　　　//这样就可以获取隐藏列的值了，比如修改出库数量的时候要先判断库存等。

}
        catch (Exception exc)
        {
            Response.Write(exc.Message);
        }
    }   
}