مشكلة في Drop Down Menu

protected void Page_Load(object sender, EventArgs e)

{

string course;

course = Request["c"].ToString(); //courseNo

Guid userId = new Guid(Membership.GetUser().ProviderUserKey.ToString());

SectionTableAdapter section = new SectionTableAdapter();

DataSet1.SectionDataTable sec;

sec = section.GetSection(course, userId);

//populate section dropdownlist

SectionM.Items.Add("Select a Section Number..");

for (int p = 0; p < sec.Rows.Count; p++)

{

SectionM.Items.Add(secبسم الله الرحمن الرحيم.SectionNo.ToString());

}

}

protected void SectionM_SelectedIndexChanged(object sender, EventArgs e)

{

LectureTableAdapter lec = new LectureTableAdapter();

DataSet1.LectureDataTable lecture_table;

string section;

int sectionNo;

string course;

course = Request["c"].ToString(); //courseNo

section = SectionM.SelectedItem.Text.ToString();

sectionNo = System.Convert.ToInt16(section);

//get information for a certain lecture

lecture_table = lec.GetTitle(course, sectionNo);

//populate the lecture title DropDownList

LectureM.Items.Add("Select a Lecture Title . . .");

for (int p = 0; p < lecture_table.Rows.Count; p++)

{

LectureM.Items.Add(lecture_tableبسم الله الرحمن الرحيم.LectureTitle.ToString());

}

}