ASP.NET实现GridView删除功能

public partial class _Default : System.Web.UI.Page
    {
        SqlDataAdapter sda = null;

        private void Bind()
        {
            string strConnectionString = "server=localhost;database=register;uid=sa;pwd=tianshi520;";
            SqlConnection conn = new SqlConnection(strConnectionString);
            conn.Open();
            string strSql = "select ID, Name as '留言者姓名', Content as '留言的信息', Time as '留言日期'" +
                " from msgboard";
            sda = new SqlDataAdapter(strSql, conn);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            conn.Close();
            gvMsg.DataKeyNames = new System.String[] { "ID" };
            gvMsg.DataSource = dt;
            gvMsg.DataBind();
        }

        protected void Page_Load(object sender, EventArgs e)
        {
            Bind();
        }

        protected void sqlDS_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
        {

        }

        protected void gvMsg_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
            string strSql = "delete from msgboard where ID = " + gvMsg.DataKeys[e.RowIndex].Value.ToString();
            string strConnectionString = "server=localhost;database=register;uid=sa;pwd=tianshi520;";
            SqlConnection conn = new SqlConnection(strConnectionString);
            conn.Open();
            SqlCommand cmd = new SqlCommand(strSql, conn);
            cmd.ExecuteNonQuery();
            conn.Close();
            Bind();
        }

        protected void gvMsg_RowCommand(object sender, GridViewCommandEventArgs e)
        {
            
        }

        protected void btnOk_Click(object sender, EventArgs e)
        {
            string strSql = string.Format("insert into msgboard(Name, Content, Time) values('{0}', '{1}', {2})",
                txtName.Text.Trim(), txtContent.Text.Trim(), DateTime.Now.ToShortDateString());
            //Response.Write(strSql);
            string strConnectionString = "server=localhost;database=register;uid=sa;pwd=tianshi520;";
            SqlConnection conn = new SqlConnection(strConnectionString);
            conn.Open();
            SqlCommand cmd = new SqlCommand(strSql, conn);
            cmd.ExecuteNonQuery();
            Bind();           
        }

        protected void gvMsg_RowEditing(object sender, GridViewEditEventArgs e)
        {
            gvMsg.EditIndex = e.NewEditIndex;
        }