无法获得转发器复选框文本

Question

我正在尝试从用户那里获得所有检查值，但我没有这样做

参考下面的//问题，当选中checkboxlist项时，它应该返回给我用户选择的内容，但它无法检测用户已检查的内容

绑定转发器项目

if (Session["test"] != null)
{
    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    SqlCommand cmdLoadQuestion = new SqlCommand("getTestQuestion",conn);
    conn.Open();
    cmdLoadQuestion.Parameters.Add("@subject",SqlDbType.VarChar).Value=Session["test"].ToString();
    cmdLoadQuestion.CommandType = CommandType.StoredProcedure;

    SqlDataReader dtrLoadQuestion;
    dtrLoadQuestion = cmdLoadQuestion.ExecuteReader();
    Repeater1.DataSource = dtrLoadQuestion;
    Repeater1.DataBind();

    dtrLoadQuestion.Close();
    conn.Close();
}
else
{
    Response.Redirect("~/HomePage.aspx");
}

//check answer from db
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
conn.Open();
foreach (RepeaterItem items in Repeater1.Items)
{
    SqlCommand cmdCheckAnswer = new SqlCommand("Select Answer From ExerciseTable where Question='" + ((Label)items.FindControl("Label3")).Text + "'", conn);
    SqlDataReader dtrCheckAnswer;
    dtrCheckAnswer = cmdCheckAnswer.ExecuteReader();
    if (dtrCheckAnswer.Read())
    {
        CheckBoxList chkList = (CheckBoxList)items.FindControl("chkOption");

        foreach (ListItem a in chkList.Items)
        {    
        //Problem
        if (a.Selected == true)
            {
                marks.InnerHtml += dtrCheckAnswer["Answer"].ToString() + " user Answer:" + a.Text + "<br/>";
            }
            else
            {
                marks.InnerHtml += "u check nth at all";
            }
        }         
    }
    else
    {
        marks.InnerHtml = "error";
    }
    dtrCheckAnswer.Close();
}
conn.Close();
//end check answer