使用类中的SqlDataReader，不能使用check in while循环声明gridview复选框吗？

Question

不能使用带有的on while循环声明gridview复选框 一个班级SqlDataReader？

protected void SelectedCourse()
{
    var courseid = lblCourseid.Text == "" ? 0 :Convert.ToInt64(lblCourseid.Text);
    var trimester = ddlTrimester.Text == "Select" ? 0 : Convert.ToInt64(ddlTrimester.Text);

    SqlConnection con = new SqlConnection(dbFunctions.connection); 
    CheckBox cblCourseCode = (CheckBox)gvDetails.Rows[e.RowIndex].FindControl("cblCourseCode");

    SqlCommand cmd = 
       new SqlCommand(@"SELECT 
                            COURSE_DIST.COURSECD, COURSE_DIST.COURSETITLE, 
                            COURSE_DIST.CREDIT, COURSE_DIST.COURSETP 
                        FROM 
                            COURSE_SELECTION 
                        INNER JOIN 
                            COURSE_DIST ON COURSE_SELECTION.COURSEID = COURSE_DIST.COURSEID 
                                        AND COURSE_SELECTION.TRIMESTER = COURSE_DIST.TRIMESTER 
                                        AND COURSE_SELECTION.COURSECD = COURSE_DIST.COURSECD 
                        WHERE 
                            COURSE_DIST.COURSEID = '" + courseid + "' 
                            AND COURSE_DIST.TRIMESTER = " + trimester + " 
                            AND COURSE_DIST.AYEAR = '" + ddlAcademicYear.Text + "' 
                            AND COURSE_DIST.SESSION = '" + ddlSession.Text + "'", con);

    con.Open();
    SqlDataReader dr = cmd.ExecuteReader();

    while (dr.Read() == true)
    {
        var coursecd = dr["COURSECD"].ToString();
        cblCourseCode.Checked = coursecd;
        cblCourseCode.Checked = true;
    }

    dr.Close();
    con.Close();
}