不带参数存储过程的使用-(绑定datalist)

SqlConnection myConnection = new SqlConnection(SqlConn.Connection);
myConnection.Open();

SqlDataAdapter myCommand = new SqlDataAdapter();
myCommand.SelectCommand = new SqlCommand();
myCommand.SelectCommand.Connection = myConnection;
myCommand.SelectCommand.CommandText = "GradeList";
myCommand.SelectCommand.CommandType = CommandType.StoredProcedure;

DataSet ds = new DataSet();
myCommand.Fill(ds);


if (ds != null && ds.Tables[0].Rows.Count > 0)
{
    this.GradeName.DataSource = ds;
    this.GradeName.DataTextField = "GradeName";
    this.GradeName.DataValueField = "GradeName";
    this.GradeName.DataBind();
    this.GradeName.Items.Insert(0, new ListItem(GradeName, "0"));
    this.GradeName.SelectedIndex = 0;
}

myConnection.Close();